1 /* 2 * sysctl.c: General linux system control interface 3 * 4 * Begun 24 March 1995, Stephen Tweedie 5 * Added /proc support, Dec 1995 6 * Added bdflush entry and intvec min/max checking, 2/23/96, Tom Dyas. 7 * Added hooks for /proc/sys/net (minor, minor patch), 96/4/1, Mike Shaver. 8 * Added kernel/java-{interpreter,appletviewer}, 96/5/10, Mike Shaver. 9 * Dynamic registration fixes, Stephen Tweedie. 10 * Added kswapd-interval, ctrl-alt-del, printk stuff, 1/8/97, Chris Horn. 11 * Made sysctl support optional via CONFIG_SYSCTL, 1/10/97, Chris 12 * Horn. 13 * Added proc_doulongvec_ms_jiffies_minmax, 09/08/99, Carlos H. Bauer. 14 * Added proc_doulongvec_minmax, 09/08/99, Carlos H. Bauer. 15 * Changed linked lists to use list.h instead of lists.h, 02/24/00, Bill 16 * Wendling. 17 * The list_for_each() macro wasn't appropriate for the sysctl loop. 18 * Removed it and replaced it with older style, 03/23/00, Bill Wendling 19 */ 20 21 #include <linux/module.h> 22 #include <linux/aio.h> 23 #include <linux/mm.h> 24 #include <linux/swap.h> 25 #include <linux/slab.h> 26 #include <linux/sysctl.h> 27 #include <linux/bitmap.h> 28 #include <linux/signal.h> 29 #include <linux/printk.h> 30 #include <linux/proc_fs.h> 31 #include <linux/security.h> 32 #include <linux/ctype.h> 33 #include <linux/kmemleak.h> 34 #include <linux/fs.h> 35 #include <linux/init.h> 36 #include <linux/kernel.h> 37 #include <linux/kobject.h> 38 #include <linux/net.h> 39 #include <linux/sysrq.h> 40 #include <linux/highuid.h> 41 #include <linux/writeback.h> 42 #include <linux/ratelimit.h> 43 #include <linux/compaction.h> 44 #include <linux/hugetlb.h> 45 #include <linux/initrd.h> 46 #include <linux/key.h> 47 #include <linux/times.h> 48 #include <linux/limits.h> 49 #include <linux/dcache.h> 50 #include <linux/dnotify.h> 51 #include <linux/syscalls.h> 52 #include <linux/vmstat.h> 53 #include <linux/nfs_fs.h> 54 #include <linux/acpi.h> 55 #include <linux/reboot.h> 56 #include <linux/ftrace.h> 57 #include <linux/perf_event.h> 58 #include <linux/kprobes.h> 59 #include <linux/pipe_fs_i.h> 60 #include <linux/oom.h> 61 #include <linux/kmod.h> 62 #include <linux/capability.h> 63 #include <linux/binfmts.h> 64 #include <linux/sched/sysctl.h> 65 #include <linux/sched/coredump.h> 66 #include <linux/kexec.h> 67 #include <linux/bpf.h> 68 #include <linux/mount.h> 69 #include <linux/pipe_fs_i.h> 70 71 #include <linux/uaccess.h> 72 #include <asm/processor.h> 73 74 #ifdef CONFIG_X86 75 #include <asm/nmi.h> 76 #include <asm/stacktrace.h> 77 #include <asm/io.h> 78 #endif 79 #ifdef CONFIG_SPARC 80 #include <asm/setup.h> 81 #endif 82 #ifdef CONFIG_BSD_PROCESS_ACCT 83 #include <linux/acct.h> 84 #endif 85 #ifdef CONFIG_RT_MUTEXES 86 #include <linux/rtmutex.h> 87 #endif 88 #if defined(CONFIG_PROVE_LOCKING) || defined(CONFIG_LOCK_STAT) 89 #include <linux/lockdep.h> 90 #endif 91 #ifdef CONFIG_CHR_DEV_SG 92 #include <scsi/sg.h> 93 #endif 94 95 #ifdef CONFIG_LOCKUP_DETECTOR 96 #include <linux/nmi.h> 97 #endif 98 99 #if defined(CONFIG_SYSCTL) 100 101 /* External variables not in a header file. */ 102 extern int suid_dumpable; 103 #ifdef CONFIG_COREDUMP 104 extern int core_uses_pid; 105 extern char core_pattern[]; 106 extern unsigned int core_pipe_limit; 107 #endif 108 extern int pid_max; 109 extern int pid_max_min, pid_max_max; 110 extern int percpu_pagelist_fraction; 111 extern int latencytop_enabled; 112 extern unsigned int sysctl_nr_open_min, sysctl_nr_open_max; 113 #ifndef CONFIG_MMU 114 extern int sysctl_nr_trim_pages; 115 #endif 116 117 /* Constants used for minimum and maximum */ 118 #ifdef CONFIG_LOCKUP_DETECTOR 119 static int sixty = 60; 120 #endif 121 122 static int __maybe_unused neg_one = -1; 123 124 static int zero; 125 static int __maybe_unused one = 1; 126 static int __maybe_unused two = 2; 127 static int __maybe_unused four = 4; 128 static unsigned long one_ul = 1; 129 static int one_hundred = 100; 130 static int one_thousand = 1000; 131 #ifdef CONFIG_PRINTK 132 static int ten_thousand = 10000; 133 #endif 134 #ifdef CONFIG_PERF_EVENTS 135 static int six_hundred_forty_kb = 640 * 1024; 136 #endif 137 138 /* this is needed for the proc_doulongvec_minmax of vm_dirty_bytes */ 139 static unsigned long dirty_bytes_min = 2 * PAGE_SIZE; 140 141 /* this is needed for the proc_dointvec_minmax for [fs_]overflow UID and GID */ 142 static int maxolduid = 65535; 143 static int minolduid; 144 145 static int ngroups_max = NGROUPS_MAX; 146 static const int cap_last_cap = CAP_LAST_CAP; 147 148 /*this is needed for proc_doulongvec_minmax of sysctl_hung_task_timeout_secs */ 149 #ifdef CONFIG_DETECT_HUNG_TASK 150 static unsigned long hung_task_timeout_max = (LONG_MAX/HZ); 151 #endif 152 153 #ifdef CONFIG_INOTIFY_USER 154 #include <linux/inotify.h> 155 #endif 156 #ifdef CONFIG_SPARC 157 #endif 158 159 #ifdef __hppa__ 160 extern int pwrsw_enabled; 161 #endif 162 163 #ifdef CONFIG_SYSCTL_ARCH_UNALIGN_ALLOW 164 extern int unaligned_enabled; 165 #endif 166 167 #ifdef CONFIG_IA64 168 extern int unaligned_dump_stack; 169 #endif 170 171 #ifdef CONFIG_SYSCTL_ARCH_UNALIGN_NO_WARN 172 extern int no_unaligned_warning; 173 #endif 174 175 #ifdef CONFIG_PROC_SYSCTL 176 177 /** 178 * enum sysctl_writes_mode - supported sysctl write modes 179 * 180 * @SYSCTL_WRITES_LEGACY: each write syscall must fully contain the sysctl value 181 * to be written, and multiple writes on the same sysctl file descriptor 182 * will rewrite the sysctl value, regardless of file position. No warning 183 * is issued when the initial position is not 0. 184 * @SYSCTL_WRITES_WARN: same as above but warn when the initial file position is 185 * not 0. 186 * @SYSCTL_WRITES_STRICT: writes to numeric sysctl entries must always be at 187 * file position 0 and the value must be fully contained in the buffer 188 * sent to the write syscall. If dealing with strings respect the file 189 * position, but restrict this to the max length of the buffer, anything 190 * passed the max lenght will be ignored. Multiple writes will append 191 * to the buffer. 192 * 193 * These write modes control how current file position affects the behavior of 194 * updating sysctl values through the proc interface on each write. 195 */ 196 enum sysctl_writes_mode { 197 SYSCTL_WRITES_LEGACY = -1, 198 SYSCTL_WRITES_WARN = 0, 199 SYSCTL_WRITES_STRICT = 1, 200 }; 201 202 static enum sysctl_writes_mode sysctl_writes_strict = SYSCTL_WRITES_STRICT; 203 204 static int proc_do_cad_pid(struct ctl_table *table, int write, 205 void __user *buffer, size_t *lenp, loff_t *ppos); 206 static int proc_taint(struct ctl_table *table, int write, 207 void __user *buffer, size_t *lenp, loff_t *ppos); 208 #endif 209 210 #ifdef CONFIG_PRINTK 211 static int proc_dointvec_minmax_sysadmin(struct ctl_table *table, int write, 212 void __user *buffer, size_t *lenp, loff_t *ppos); 213 #endif 214 215 static int proc_dointvec_minmax_coredump(struct ctl_table *table, int write, 216 void __user *buffer, size_t *lenp, loff_t *ppos); 217 #ifdef CONFIG_COREDUMP 218 static int proc_dostring_coredump(struct ctl_table *table, int write, 219 void __user *buffer, size_t *lenp, loff_t *ppos); 220 #endif 221 static int proc_dopipe_max_size(struct ctl_table *table, int write, 222 void __user *buffer, size_t *lenp, loff_t *ppos); 223 224 #ifdef CONFIG_MAGIC_SYSRQ 225 /* Note: sysrq code uses it's own private copy */ 226 static int __sysrq_enabled = CONFIG_MAGIC_SYSRQ_DEFAULT_ENABLE; 227 228 static int sysrq_sysctl_handler(struct ctl_table *table, int write, 229 void __user *buffer, size_t *lenp, 230 loff_t *ppos) 231 { 232 int error; 233 234 error = proc_dointvec(table, write, buffer, lenp, ppos); 235 if (error) 236 return error; 237 238 if (write) 239 sysrq_toggle_support(__sysrq_enabled); 240 241 return 0; 242 } 243 244 #endif 245 246 static struct ctl_table kern_table[]; 247 static struct ctl_table vm_table[]; 248 static struct ctl_table fs_table[]; 249 static struct ctl_table debug_table[]; 250 static struct ctl_table dev_table[]; 251 extern struct ctl_table random_table[]; 252 #ifdef CONFIG_EPOLL 253 extern struct ctl_table epoll_table[]; 254 #endif 255 256 #ifdef HAVE_ARCH_PICK_MMAP_LAYOUT 257 int sysctl_legacy_va_layout; 258 #endif 259 260 /* The default sysctl tables: */ 261 262 static struct ctl_table sysctl_base_table[] = { 263 { 264 .procname = "kernel", 265 .mode = 0555, 266 .child = kern_table, 267 }, 268 { 269 .procname = "vm", 270 .mode = 0555, 271 .child = vm_table, 272 }, 273 { 274 .procname = "fs", 275 .mode = 0555, 276 .child = fs_table, 277 }, 278 { 279 .procname = "debug", 280 .mode = 0555, 281 .child = debug_table, 282 }, 283 { 284 .procname = "dev", 285 .mode = 0555, 286 .child = dev_table, 287 }, 288 { } 289 }; 290 291 #ifdef CONFIG_SCHED_DEBUG 292 static int min_sched_granularity_ns = 100000; /* 100 usecs */ 293 static int max_sched_granularity_ns = NSEC_PER_SEC; /* 1 second */ 294 static int min_wakeup_granularity_ns; /* 0 usecs */ 295 static int max_wakeup_granularity_ns = NSEC_PER_SEC; /* 1 second */ 296 #ifdef CONFIG_SMP 297 static int min_sched_tunable_scaling = SCHED_TUNABLESCALING_NONE; 298 static int max_sched_tunable_scaling = SCHED_TUNABLESCALING_END-1; 299 #endif /* CONFIG_SMP */ 300 #endif /* CONFIG_SCHED_DEBUG */ 301 302 #ifdef CONFIG_COMPACTION 303 static int min_extfrag_threshold; 304 static int max_extfrag_threshold = 1000; 305 #endif 306 307 static struct ctl_table kern_table[] = { 308 { 309 .procname = "sched_child_runs_first", 310 .data = &sysctl_sched_child_runs_first, 311 .maxlen = sizeof(unsigned int), 312 .mode = 0644, 313 .proc_handler = proc_dointvec, 314 }, 315 #ifdef CONFIG_SCHED_DEBUG 316 { 317 .procname = "sched_min_granularity_ns", 318 .data = &sysctl_sched_min_granularity, 319 .maxlen = sizeof(unsigned int), 320 .mode = 0644, 321 .proc_handler = sched_proc_update_handler, 322 .extra1 = &min_sched_granularity_ns, 323 .extra2 = &max_sched_granularity_ns, 324 }, 325 { 326 .procname = "sched_latency_ns", 327 .data = &sysctl_sched_latency, 328 .maxlen = sizeof(unsigned int), 329 .mode = 0644, 330 .proc_handler = sched_proc_update_handler, 331 .extra1 = &min_sched_granularity_ns, 332 .extra2 = &max_sched_granularity_ns, 333 }, 334 { 335 .procname = "sched_wakeup_granularity_ns", 336 .data = &sysctl_sched_wakeup_granularity, 337 .maxlen = sizeof(unsigned int), 338 .mode = 0644, 339 .proc_handler = sched_proc_update_handler, 340 .extra1 = &min_wakeup_granularity_ns, 341 .extra2 = &max_wakeup_granularity_ns, 342 }, 343 #ifdef CONFIG_SMP 344 { 345 .procname = "sched_tunable_scaling", 346 .data = &sysctl_sched_tunable_scaling, 347 .maxlen = sizeof(enum sched_tunable_scaling), 348 .mode = 0644, 349 .proc_handler = sched_proc_update_handler, 350 .extra1 = &min_sched_tunable_scaling, 351 .extra2 = &max_sched_tunable_scaling, 352 }, 353 { 354 .procname = "sched_migration_cost_ns", 355 .data = &sysctl_sched_migration_cost, 356 .maxlen = sizeof(unsigned int), 357 .mode = 0644, 358 .proc_handler = proc_dointvec, 359 }, 360 { 361 .procname = "sched_nr_migrate", 362 .data = &sysctl_sched_nr_migrate, 363 .maxlen = sizeof(unsigned int), 364 .mode = 0644, 365 .proc_handler = proc_dointvec, 366 }, 367 { 368 .procname = "sched_time_avg_ms", 369 .data = &sysctl_sched_time_avg, 370 .maxlen = sizeof(unsigned int), 371 .mode = 0644, 372 .proc_handler = proc_dointvec_minmax, 373 .extra1 = &one, 374 }, 375 #ifdef CONFIG_SCHEDSTATS 376 { 377 .procname = "sched_schedstats", 378 .data = NULL, 379 .maxlen = sizeof(unsigned int), 380 .mode = 0644, 381 .proc_handler = sysctl_schedstats, 382 .extra1 = &zero, 383 .extra2 = &one, 384 }, 385 #endif /* CONFIG_SCHEDSTATS */ 386 #endif /* CONFIG_SMP */ 387 #ifdef CONFIG_NUMA_BALANCING 388 { 389 .procname = "numa_balancing_scan_delay_ms", 390 .data = &sysctl_numa_balancing_scan_delay, 391 .maxlen = sizeof(unsigned int), 392 .mode = 0644, 393 .proc_handler = proc_dointvec, 394 }, 395 { 396 .procname = "numa_balancing_scan_period_min_ms", 397 .data = &sysctl_numa_balancing_scan_period_min, 398 .maxlen = sizeof(unsigned int), 399 .mode = 0644, 400 .proc_handler = proc_dointvec, 401 }, 402 { 403 .procname = "numa_balancing_scan_period_max_ms", 404 .data = &sysctl_numa_balancing_scan_period_max, 405 .maxlen = sizeof(unsigned int), 406 .mode = 0644, 407 .proc_handler = proc_dointvec, 408 }, 409 { 410 .procname = "numa_balancing_scan_size_mb", 411 .data = &sysctl_numa_balancing_scan_size, 412 .maxlen = sizeof(unsigned int), 413 .mode = 0644, 414 .proc_handler = proc_dointvec_minmax, 415 .extra1 = &one, 416 }, 417 { 418 .procname = "numa_balancing", 419 .data = NULL, /* filled in by handler */ 420 .maxlen = sizeof(unsigned int), 421 .mode = 0644, 422 .proc_handler = sysctl_numa_balancing, 423 .extra1 = &zero, 424 .extra2 = &one, 425 }, 426 #endif /* CONFIG_NUMA_BALANCING */ 427 #endif /* CONFIG_SCHED_DEBUG */ 428 { 429 .procname = "sched_rt_period_us", 430 .data = &sysctl_sched_rt_period, 431 .maxlen = sizeof(unsigned int), 432 .mode = 0644, 433 .proc_handler = sched_rt_handler, 434 }, 435 { 436 .procname = "sched_rt_runtime_us", 437 .data = &sysctl_sched_rt_runtime, 438 .maxlen = sizeof(int), 439 .mode = 0644, 440 .proc_handler = sched_rt_handler, 441 }, 442 { 443 .procname = "sched_rr_timeslice_ms", 444 .data = &sysctl_sched_rr_timeslice, 445 .maxlen = sizeof(int), 446 .mode = 0644, 447 .proc_handler = sched_rr_handler, 448 }, 449 #ifdef CONFIG_SCHED_AUTOGROUP 450 { 451 .procname = "sched_autogroup_enabled", 452 .data = &sysctl_sched_autogroup_enabled, 453 .maxlen = sizeof(unsigned int), 454 .mode = 0644, 455 .proc_handler = proc_dointvec_minmax, 456 .extra1 = &zero, 457 .extra2 = &one, 458 }, 459 #endif 460 #ifdef CONFIG_CFS_BANDWIDTH 461 { 462 .procname = "sched_cfs_bandwidth_slice_us", 463 .data = &sysctl_sched_cfs_bandwidth_slice, 464 .maxlen = sizeof(unsigned int), 465 .mode = 0644, 466 .proc_handler = proc_dointvec_minmax, 467 .extra1 = &one, 468 }, 469 #endif 470 #ifdef CONFIG_PROVE_LOCKING 471 { 472 .procname = "prove_locking", 473 .data = &prove_locking, 474 .maxlen = sizeof(int), 475 .mode = 0644, 476 .proc_handler = proc_dointvec, 477 }, 478 #endif 479 #ifdef CONFIG_LOCK_STAT 480 { 481 .procname = "lock_stat", 482 .data = &lock_stat, 483 .maxlen = sizeof(int), 484 .mode = 0644, 485 .proc_handler = proc_dointvec, 486 }, 487 #endif 488 { 489 .procname = "panic", 490 .data = &panic_timeout, 491 .maxlen = sizeof(int), 492 .mode = 0644, 493 .proc_handler = proc_dointvec, 494 }, 495 #ifdef CONFIG_COREDUMP 496 { 497 .procname = "core_uses_pid", 498 .data = &core_uses_pid, 499 .maxlen = sizeof(int), 500 .mode = 0644, 501 .proc_handler = proc_dointvec, 502 }, 503 { 504 .procname = "core_pattern", 505 .data = core_pattern, 506 .maxlen = CORENAME_MAX_SIZE, 507 .mode = 0644, 508 .proc_handler = proc_dostring_coredump, 509 }, 510 { 511 .procname = "core_pipe_limit", 512 .data = &core_pipe_limit, 513 .maxlen = sizeof(unsigned int), 514 .mode = 0644, 515 .proc_handler = proc_dointvec, 516 }, 517 #endif 518 #ifdef CONFIG_PROC_SYSCTL 519 { 520 .procname = "tainted", 521 .maxlen = sizeof(long), 522 .mode = 0644, 523 .proc_handler = proc_taint, 524 }, 525 { 526 .procname = "sysctl_writes_strict", 527 .data = &sysctl_writes_strict, 528 .maxlen = sizeof(int), 529 .mode = 0644, 530 .proc_handler = proc_dointvec_minmax, 531 .extra1 = &neg_one, 532 .extra2 = &one, 533 }, 534 #endif 535 #ifdef CONFIG_LATENCYTOP 536 { 537 .procname = "latencytop", 538 .data = &latencytop_enabled, 539 .maxlen = sizeof(int), 540 .mode = 0644, 541 .proc_handler = sysctl_latencytop, 542 }, 543 #endif 544 #ifdef CONFIG_BLK_DEV_INITRD 545 { 546 .procname = "real-root-dev", 547 .data = &real_root_dev, 548 .maxlen = sizeof(int), 549 .mode = 0644, 550 .proc_handler = proc_dointvec, 551 }, 552 #endif 553 { 554 .procname = "print-fatal-signals", 555 .data = &print_fatal_signals, 556 .maxlen = sizeof(int), 557 .mode = 0644, 558 .proc_handler = proc_dointvec, 559 }, 560 #ifdef CONFIG_SPARC 561 { 562 .procname = "reboot-cmd", 563 .data = reboot_command, 564 .maxlen = 256, 565 .mode = 0644, 566 .proc_handler = proc_dostring, 567 }, 568 { 569 .procname = "stop-a", 570 .data = &stop_a_enabled, 571 .maxlen = sizeof (int), 572 .mode = 0644, 573 .proc_handler = proc_dointvec, 574 }, 575 { 576 .procname = "scons-poweroff", 577 .data = &scons_pwroff, 578 .maxlen = sizeof (int), 579 .mode = 0644, 580 .proc_handler = proc_dointvec, 581 }, 582 #endif 583 #ifdef CONFIG_SPARC64 584 { 585 .procname = "tsb-ratio", 586 .data = &sysctl_tsb_ratio, 587 .maxlen = sizeof (int), 588 .mode = 0644, 589 .proc_handler = proc_dointvec, 590 }, 591 #endif 592 #ifdef __hppa__ 593 { 594 .procname = "soft-power", 595 .data = &pwrsw_enabled, 596 .maxlen = sizeof (int), 597 .mode = 0644, 598 .proc_handler = proc_dointvec, 599 }, 600 #endif 601 #ifdef CONFIG_SYSCTL_ARCH_UNALIGN_ALLOW 602 { 603 .procname = "unaligned-trap", 604 .data = &unaligned_enabled, 605 .maxlen = sizeof (int), 606 .mode = 0644, 607 .proc_handler = proc_dointvec, 608 }, 609 #endif 610 { 611 .procname = "ctrl-alt-del", 612 .data = &C_A_D, 613 .maxlen = sizeof(int), 614 .mode = 0644, 615 .proc_handler = proc_dointvec, 616 }, 617 #ifdef CONFIG_FUNCTION_TRACER 618 { 619 .procname = "ftrace_enabled", 620 .data = &ftrace_enabled, 621 .maxlen = sizeof(int), 622 .mode = 0644, 623 .proc_handler = ftrace_enable_sysctl, 624 }, 625 #endif 626 #ifdef CONFIG_STACK_TRACER 627 { 628 .procname = "stack_tracer_enabled", 629 .data = &stack_tracer_enabled, 630 .maxlen = sizeof(int), 631 .mode = 0644, 632 .proc_handler = stack_trace_sysctl, 633 }, 634 #endif 635 #ifdef CONFIG_TRACING 636 { 637 .procname = "ftrace_dump_on_oops", 638 .data = &ftrace_dump_on_oops, 639 .maxlen = sizeof(int), 640 .mode = 0644, 641 .proc_handler = proc_dointvec, 642 }, 643 { 644 .procname = "traceoff_on_warning", 645 .data = &__disable_trace_on_warning, 646 .maxlen = sizeof(__disable_trace_on_warning), 647 .mode = 0644, 648 .proc_handler = proc_dointvec, 649 }, 650 { 651 .procname = "tracepoint_printk", 652 .data = &tracepoint_printk, 653 .maxlen = sizeof(tracepoint_printk), 654 .mode = 0644, 655 .proc_handler = tracepoint_printk_sysctl, 656 }, 657 #endif 658 #ifdef CONFIG_KEXEC_CORE 659 { 660 .procname = "kexec_load_disabled", 661 .data = &kexec_load_disabled, 662 .maxlen = sizeof(int), 663 .mode = 0644, 664 /* only handle a transition from default "0" to "1" */ 665 .proc_handler = proc_dointvec_minmax, 666 .extra1 = &one, 667 .extra2 = &one, 668 }, 669 #endif 670 #ifdef CONFIG_MODULES 671 { 672 .procname = "modprobe", 673 .data = &modprobe_path, 674 .maxlen = KMOD_PATH_LEN, 675 .mode = 0644, 676 .proc_handler = proc_dostring, 677 }, 678 { 679 .procname = "modules_disabled", 680 .data = &modules_disabled, 681 .maxlen = sizeof(int), 682 .mode = 0644, 683 /* only handle a transition from default "0" to "1" */ 684 .proc_handler = proc_dointvec_minmax, 685 .extra1 = &one, 686 .extra2 = &one, 687 }, 688 #endif 689 #ifdef CONFIG_UEVENT_HELPER 690 { 691 .procname = "hotplug", 692 .data = &uevent_helper, 693 .maxlen = UEVENT_HELPER_PATH_LEN, 694 .mode = 0644, 695 .proc_handler = proc_dostring, 696 }, 697 #endif 698 #ifdef CONFIG_CHR_DEV_SG 699 { 700 .procname = "sg-big-buff", 701 .data = &sg_big_buff, 702 .maxlen = sizeof (int), 703 .mode = 0444, 704 .proc_handler = proc_dointvec, 705 }, 706 #endif 707 #ifdef CONFIG_BSD_PROCESS_ACCT 708 { 709 .procname = "acct", 710 .data = &acct_parm, 711 .maxlen = 3*sizeof(int), 712 .mode = 0644, 713 .proc_handler = proc_dointvec, 714 }, 715 #endif 716 #ifdef CONFIG_MAGIC_SYSRQ 717 { 718 .procname = "sysrq", 719 .data = &__sysrq_enabled, 720 .maxlen = sizeof (int), 721 .mode = 0644, 722 .proc_handler = sysrq_sysctl_handler, 723 }, 724 #endif 725 #ifdef CONFIG_PROC_SYSCTL 726 { 727 .procname = "cad_pid", 728 .data = NULL, 729 .maxlen = sizeof (int), 730 .mode = 0600, 731 .proc_handler = proc_do_cad_pid, 732 }, 733 #endif 734 { 735 .procname = "threads-max", 736 .data = NULL, 737 .maxlen = sizeof(int), 738 .mode = 0644, 739 .proc_handler = sysctl_max_threads, 740 }, 741 { 742 .procname = "random", 743 .mode = 0555, 744 .child = random_table, 745 }, 746 { 747 .procname = "usermodehelper", 748 .mode = 0555, 749 .child = usermodehelper_table, 750 }, 751 { 752 .procname = "overflowuid", 753 .data = &overflowuid, 754 .maxlen = sizeof(int), 755 .mode = 0644, 756 .proc_handler = proc_dointvec_minmax, 757 .extra1 = &minolduid, 758 .extra2 = &maxolduid, 759 }, 760 { 761 .procname = "overflowgid", 762 .data = &overflowgid, 763 .maxlen = sizeof(int), 764 .mode = 0644, 765 .proc_handler = proc_dointvec_minmax, 766 .extra1 = &minolduid, 767 .extra2 = &maxolduid, 768 }, 769 #ifdef CONFIG_S390 770 #ifdef CONFIG_MATHEMU 771 { 772 .procname = "ieee_emulation_warnings", 773 .data = &sysctl_ieee_emulation_warnings, 774 .maxlen = sizeof(int), 775 .mode = 0644, 776 .proc_handler = proc_dointvec, 777 }, 778 #endif 779 { 780 .procname = "userprocess_debug", 781 .data = &show_unhandled_signals, 782 .maxlen = sizeof(int), 783 .mode = 0644, 784 .proc_handler = proc_dointvec, 785 }, 786 #endif 787 { 788 .procname = "pid_max", 789 .data = &pid_max, 790 .maxlen = sizeof (int), 791 .mode = 0644, 792 .proc_handler = proc_dointvec_minmax, 793 .extra1 = &pid_max_min, 794 .extra2 = &pid_max_max, 795 }, 796 { 797 .procname = "panic_on_oops", 798 .data = &panic_on_oops, 799 .maxlen = sizeof(int), 800 .mode = 0644, 801 .proc_handler = proc_dointvec, 802 }, 803 #if defined CONFIG_PRINTK 804 { 805 .procname = "printk", 806 .data = &console_loglevel, 807 .maxlen = 4*sizeof(int), 808 .mode = 0644, 809 .proc_handler = proc_dointvec, 810 }, 811 { 812 .procname = "printk_ratelimit", 813 .data = &printk_ratelimit_state.interval, 814 .maxlen = sizeof(int), 815 .mode = 0644, 816 .proc_handler = proc_dointvec_jiffies, 817 }, 818 { 819 .procname = "printk_ratelimit_burst", 820 .data = &printk_ratelimit_state.burst, 821 .maxlen = sizeof(int), 822 .mode = 0644, 823 .proc_handler = proc_dointvec, 824 }, 825 { 826 .procname = "printk_delay", 827 .data = &printk_delay_msec, 828 .maxlen = sizeof(int), 829 .mode = 0644, 830 .proc_handler = proc_dointvec_minmax, 831 .extra1 = &zero, 832 .extra2 = &ten_thousand, 833 }, 834 { 835 .procname = "printk_devkmsg", 836 .data = devkmsg_log_str, 837 .maxlen = DEVKMSG_STR_MAX_SIZE, 838 .mode = 0644, 839 .proc_handler = devkmsg_sysctl_set_loglvl, 840 }, 841 { 842 .procname = "dmesg_restrict", 843 .data = &dmesg_restrict, 844 .maxlen = sizeof(int), 845 .mode = 0644, 846 .proc_handler = proc_dointvec_minmax_sysadmin, 847 .extra1 = &zero, 848 .extra2 = &one, 849 }, 850 { 851 .procname = "kptr_restrict", 852 .data = &kptr_restrict, 853 .maxlen = sizeof(int), 854 .mode = 0644, 855 .proc_handler = proc_dointvec_minmax_sysadmin, 856 .extra1 = &zero, 857 .extra2 = &two, 858 }, 859 #endif 860 { 861 .procname = "ngroups_max", 862 .data = &ngroups_max, 863 .maxlen = sizeof (int), 864 .mode = 0444, 865 .proc_handler = proc_dointvec, 866 }, 867 { 868 .procname = "cap_last_cap", 869 .data = (void *)&cap_last_cap, 870 .maxlen = sizeof(int), 871 .mode = 0444, 872 .proc_handler = proc_dointvec, 873 }, 874 #if defined(CONFIG_LOCKUP_DETECTOR) 875 { 876 .procname = "watchdog", 877 .data = &watchdog_user_enabled, 878 .maxlen = sizeof(int), 879 .mode = 0644, 880 .proc_handler = proc_watchdog, 881 .extra1 = &zero, 882 .extra2 = &one, 883 }, 884 { 885 .procname = "watchdog_thresh", 886 .data = &watchdog_thresh, 887 .maxlen = sizeof(int), 888 .mode = 0644, 889 .proc_handler = proc_watchdog_thresh, 890 .extra1 = &zero, 891 .extra2 = &sixty, 892 }, 893 { 894 .procname = "nmi_watchdog", 895 .data = &nmi_watchdog_user_enabled, 896 .maxlen = sizeof(int), 897 .mode = NMI_WATCHDOG_SYSCTL_PERM, 898 .proc_handler = proc_nmi_watchdog, 899 .extra1 = &zero, 900 .extra2 = &one, 901 }, 902 { 903 .procname = "watchdog_cpumask", 904 .data = &watchdog_cpumask_bits, 905 .maxlen = NR_CPUS, 906 .mode = 0644, 907 .proc_handler = proc_watchdog_cpumask, 908 }, 909 #ifdef CONFIG_SOFTLOCKUP_DETECTOR 910 { 911 .procname = "soft_watchdog", 912 .data = &soft_watchdog_user_enabled, 913 .maxlen = sizeof(int), 914 .mode = 0644, 915 .proc_handler = proc_soft_watchdog, 916 .extra1 = &zero, 917 .extra2 = &one, 918 }, 919 { 920 .procname = "softlockup_panic", 921 .data = &softlockup_panic, 922 .maxlen = sizeof(int), 923 .mode = 0644, 924 .proc_handler = proc_dointvec_minmax, 925 .extra1 = &zero, 926 .extra2 = &one, 927 }, 928 #ifdef CONFIG_SMP 929 { 930 .procname = "softlockup_all_cpu_backtrace", 931 .data = &sysctl_softlockup_all_cpu_backtrace, 932 .maxlen = sizeof(int), 933 .mode = 0644, 934 .proc_handler = proc_dointvec_minmax, 935 .extra1 = &zero, 936 .extra2 = &one, 937 }, 938 #endif /* CONFIG_SMP */ 939 #endif 940 #ifdef CONFIG_HARDLOCKUP_DETECTOR 941 { 942 .procname = "hardlockup_panic", 943 .data = &hardlockup_panic, 944 .maxlen = sizeof(int), 945 .mode = 0644, 946 .proc_handler = proc_dointvec_minmax, 947 .extra1 = &zero, 948 .extra2 = &one, 949 }, 950 #ifdef CONFIG_SMP 951 { 952 .procname = "hardlockup_all_cpu_backtrace", 953 .data = &sysctl_hardlockup_all_cpu_backtrace, 954 .maxlen = sizeof(int), 955 .mode = 0644, 956 .proc_handler = proc_dointvec_minmax, 957 .extra1 = &zero, 958 .extra2 = &one, 959 }, 960 #endif /* CONFIG_SMP */ 961 #endif 962 #endif 963 964 #if defined(CONFIG_X86_LOCAL_APIC) && defined(CONFIG_X86) 965 { 966 .procname = "unknown_nmi_panic", 967 .data = &unknown_nmi_panic, 968 .maxlen = sizeof (int), 969 .mode = 0644, 970 .proc_handler = proc_dointvec, 971 }, 972 #endif 973 #if defined(CONFIG_X86) 974 { 975 .procname = "panic_on_unrecovered_nmi", 976 .data = &panic_on_unrecovered_nmi, 977 .maxlen = sizeof(int), 978 .mode = 0644, 979 .proc_handler = proc_dointvec, 980 }, 981 { 982 .procname = "panic_on_io_nmi", 983 .data = &panic_on_io_nmi, 984 .maxlen = sizeof(int), 985 .mode = 0644, 986 .proc_handler = proc_dointvec, 987 }, 988 #ifdef CONFIG_DEBUG_STACKOVERFLOW 989 { 990 .procname = "panic_on_stackoverflow", 991 .data = &sysctl_panic_on_stackoverflow, 992 .maxlen = sizeof(int), 993 .mode = 0644, 994 .proc_handler = proc_dointvec, 995 }, 996 #endif 997 { 998 .procname = "bootloader_type", 999 .data = &bootloader_type, 1000 .maxlen = sizeof (int), 1001 .mode = 0444, 1002 .proc_handler = proc_dointvec, 1003 }, 1004 { 1005 .procname = "bootloader_version", 1006 .data = &bootloader_version, 1007 .maxlen = sizeof (int), 1008 .mode = 0444, 1009 .proc_handler = proc_dointvec, 1010 }, 1011 { 1012 .procname = "io_delay_type", 1013 .data = &io_delay_type, 1014 .maxlen = sizeof(int), 1015 .mode = 0644, 1016 .proc_handler = proc_dointvec, 1017 }, 1018 #endif 1019 #if defined(CONFIG_MMU) 1020 { 1021 .procname = "randomize_va_space", 1022 .data = &randomize_va_space, 1023 .maxlen = sizeof(int), 1024 .mode = 0644, 1025 .proc_handler = proc_dointvec, 1026 }, 1027 #endif 1028 #if defined(CONFIG_S390) && defined(CONFIG_SMP) 1029 { 1030 .procname = "spin_retry", 1031 .data = &spin_retry, 1032 .maxlen = sizeof (int), 1033 .mode = 0644, 1034 .proc_handler = proc_dointvec, 1035 }, 1036 #endif 1037 #if defined(CONFIG_ACPI_SLEEP) && defined(CONFIG_X86) 1038 { 1039 .procname = "acpi_video_flags", 1040 .data = &acpi_realmode_flags, 1041 .maxlen = sizeof (unsigned long), 1042 .mode = 0644, 1043 .proc_handler = proc_doulongvec_minmax, 1044 }, 1045 #endif 1046 #ifdef CONFIG_SYSCTL_ARCH_UNALIGN_NO_WARN 1047 { 1048 .procname = "ignore-unaligned-usertrap", 1049 .data = &no_unaligned_warning, 1050 .maxlen = sizeof (int), 1051 .mode = 0644, 1052 .proc_handler = proc_dointvec, 1053 }, 1054 #endif 1055 #ifdef CONFIG_IA64 1056 { 1057 .procname = "unaligned-dump-stack", 1058 .data = &unaligned_dump_stack, 1059 .maxlen = sizeof (int), 1060 .mode = 0644, 1061 .proc_handler = proc_dointvec, 1062 }, 1063 #endif 1064 #ifdef CONFIG_DETECT_HUNG_TASK 1065 { 1066 .procname = "hung_task_panic", 1067 .data = &sysctl_hung_task_panic, 1068 .maxlen = sizeof(int), 1069 .mode = 0644, 1070 .proc_handler = proc_dointvec_minmax, 1071 .extra1 = &zero, 1072 .extra2 = &one, 1073 }, 1074 { 1075 .procname = "hung_task_check_count", 1076 .data = &sysctl_hung_task_check_count, 1077 .maxlen = sizeof(int), 1078 .mode = 0644, 1079 .proc_handler = proc_dointvec_minmax, 1080 .extra1 = &zero, 1081 }, 1082 { 1083 .procname = "hung_task_timeout_secs", 1084 .data = &sysctl_hung_task_timeout_secs, 1085 .maxlen = sizeof(unsigned long), 1086 .mode = 0644, 1087 .proc_handler = proc_dohung_task_timeout_secs, 1088 .extra2 = &hung_task_timeout_max, 1089 }, 1090 { 1091 .procname = "hung_task_warnings", 1092 .data = &sysctl_hung_task_warnings, 1093 .maxlen = sizeof(int), 1094 .mode = 0644, 1095 .proc_handler = proc_dointvec_minmax, 1096 .extra1 = &neg_one, 1097 }, 1098 #endif 1099 #ifdef CONFIG_RT_MUTEXES 1100 { 1101 .procname = "max_lock_depth", 1102 .data = &max_lock_depth, 1103 .maxlen = sizeof(int), 1104 .mode = 0644, 1105 .proc_handler = proc_dointvec, 1106 }, 1107 #endif 1108 { 1109 .procname = "poweroff_cmd", 1110 .data = &poweroff_cmd, 1111 .maxlen = POWEROFF_CMD_PATH_LEN, 1112 .mode = 0644, 1113 .proc_handler = proc_dostring, 1114 }, 1115 #ifdef CONFIG_KEYS 1116 { 1117 .procname = "keys", 1118 .mode = 0555, 1119 .child = key_sysctls, 1120 }, 1121 #endif 1122 #ifdef CONFIG_PERF_EVENTS 1123 /* 1124 * User-space scripts rely on the existence of this file 1125 * as a feature check for perf_events being enabled. 1126 * 1127 * So it's an ABI, do not remove! 1128 */ 1129 { 1130 .procname = "perf_event_paranoid", 1131 .data = &sysctl_perf_event_paranoid, 1132 .maxlen = sizeof(sysctl_perf_event_paranoid), 1133 .mode = 0644, 1134 .proc_handler = proc_dointvec, 1135 }, 1136 { 1137 .procname = "perf_event_mlock_kb", 1138 .data = &sysctl_perf_event_mlock, 1139 .maxlen = sizeof(sysctl_perf_event_mlock), 1140 .mode = 0644, 1141 .proc_handler = proc_dointvec, 1142 }, 1143 { 1144 .procname = "perf_event_max_sample_rate", 1145 .data = &sysctl_perf_event_sample_rate, 1146 .maxlen = sizeof(sysctl_perf_event_sample_rate), 1147 .mode = 0644, 1148 .proc_handler = perf_proc_update_handler, 1149 .extra1 = &one, 1150 }, 1151 { 1152 .procname = "perf_cpu_time_max_percent", 1153 .data = &sysctl_perf_cpu_time_max_percent, 1154 .maxlen = sizeof(sysctl_perf_cpu_time_max_percent), 1155 .mode = 0644, 1156 .proc_handler = perf_cpu_time_max_percent_handler, 1157 .extra1 = &zero, 1158 .extra2 = &one_hundred, 1159 }, 1160 { 1161 .procname = "perf_event_max_stack", 1162 .data = &sysctl_perf_event_max_stack, 1163 .maxlen = sizeof(sysctl_perf_event_max_stack), 1164 .mode = 0644, 1165 .proc_handler = perf_event_max_stack_handler, 1166 .extra1 = &zero, 1167 .extra2 = &six_hundred_forty_kb, 1168 }, 1169 { 1170 .procname = "perf_event_max_contexts_per_stack", 1171 .data = &sysctl_perf_event_max_contexts_per_stack, 1172 .maxlen = sizeof(sysctl_perf_event_max_contexts_per_stack), 1173 .mode = 0644, 1174 .proc_handler = perf_event_max_stack_handler, 1175 .extra1 = &zero, 1176 .extra2 = &one_thousand, 1177 }, 1178 #endif 1179 { 1180 .procname = "panic_on_warn", 1181 .data = &panic_on_warn, 1182 .maxlen = sizeof(int), 1183 .mode = 0644, 1184 .proc_handler = proc_dointvec_minmax, 1185 .extra1 = &zero, 1186 .extra2 = &one, 1187 }, 1188 #if defined(CONFIG_SMP) && defined(CONFIG_NO_HZ_COMMON) 1189 { 1190 .procname = "timer_migration", 1191 .data = &sysctl_timer_migration, 1192 .maxlen = sizeof(unsigned int), 1193 .mode = 0644, 1194 .proc_handler = timer_migration_handler, 1195 .extra1 = &zero, 1196 .extra2 = &one, 1197 }, 1198 #endif 1199 #ifdef CONFIG_BPF_SYSCALL 1200 { 1201 .procname = "unprivileged_bpf_disabled", 1202 .data = &sysctl_unprivileged_bpf_disabled, 1203 .maxlen = sizeof(sysctl_unprivileged_bpf_disabled), 1204 .mode = 0644, 1205 /* only handle a transition from default "0" to "1" */ 1206 .proc_handler = proc_dointvec_minmax, 1207 .extra1 = &one, 1208 .extra2 = &one, 1209 }, 1210 #endif 1211 #if defined(CONFIG_TREE_RCU) || defined(CONFIG_PREEMPT_RCU) 1212 { 1213 .procname = "panic_on_rcu_stall", 1214 .data = &sysctl_panic_on_rcu_stall, 1215 .maxlen = sizeof(sysctl_panic_on_rcu_stall), 1216 .mode = 0644, 1217 .proc_handler = proc_dointvec_minmax, 1218 .extra1 = &zero, 1219 .extra2 = &one, 1220 }, 1221 #endif 1222 { } 1223 }; 1224 1225 static struct ctl_table vm_table[] = { 1226 { 1227 .procname = "overcommit_memory", 1228 .data = &sysctl_overcommit_memory, 1229 .maxlen = sizeof(sysctl_overcommit_memory), 1230 .mode = 0644, 1231 .proc_handler = proc_dointvec_minmax, 1232 .extra1 = &zero, 1233 .extra2 = &two, 1234 }, 1235 { 1236 .procname = "panic_on_oom", 1237 .data = &sysctl_panic_on_oom, 1238 .maxlen = sizeof(sysctl_panic_on_oom), 1239 .mode = 0644, 1240 .proc_handler = proc_dointvec_minmax, 1241 .extra1 = &zero, 1242 .extra2 = &two, 1243 }, 1244 { 1245 .procname = "oom_kill_allocating_task", 1246 .data = &sysctl_oom_kill_allocating_task, 1247 .maxlen = sizeof(sysctl_oom_kill_allocating_task), 1248 .mode = 0644, 1249 .proc_handler = proc_dointvec, 1250 }, 1251 { 1252 .procname = "oom_dump_tasks", 1253 .data = &sysctl_oom_dump_tasks, 1254 .maxlen = sizeof(sysctl_oom_dump_tasks), 1255 .mode = 0644, 1256 .proc_handler = proc_dointvec, 1257 }, 1258 { 1259 .procname = "overcommit_ratio", 1260 .data = &sysctl_overcommit_ratio, 1261 .maxlen = sizeof(sysctl_overcommit_ratio), 1262 .mode = 0644, 1263 .proc_handler = overcommit_ratio_handler, 1264 }, 1265 { 1266 .procname = "overcommit_kbytes", 1267 .data = &sysctl_overcommit_kbytes, 1268 .maxlen = sizeof(sysctl_overcommit_kbytes), 1269 .mode = 0644, 1270 .proc_handler = overcommit_kbytes_handler, 1271 }, 1272 { 1273 .procname = "page-cluster", 1274 .data = &page_cluster, 1275 .maxlen = sizeof(int), 1276 .mode = 0644, 1277 .proc_handler = proc_dointvec_minmax, 1278 .extra1 = &zero, 1279 }, 1280 { 1281 .procname = "dirty_background_ratio", 1282 .data = &dirty_background_ratio, 1283 .maxlen = sizeof(dirty_background_ratio), 1284 .mode = 0644, 1285 .proc_handler = dirty_background_ratio_handler, 1286 .extra1 = &zero, 1287 .extra2 = &one_hundred, 1288 }, 1289 { 1290 .procname = "dirty_background_bytes", 1291 .data = &dirty_background_bytes, 1292 .maxlen = sizeof(dirty_background_bytes), 1293 .mode = 0644, 1294 .proc_handler = dirty_background_bytes_handler, 1295 .extra1 = &one_ul, 1296 }, 1297 { 1298 .procname = "dirty_ratio", 1299 .data = &vm_dirty_ratio, 1300 .maxlen = sizeof(vm_dirty_ratio), 1301 .mode = 0644, 1302 .proc_handler = dirty_ratio_handler, 1303 .extra1 = &zero, 1304 .extra2 = &one_hundred, 1305 }, 1306 { 1307 .procname = "dirty_bytes", 1308 .data = &vm_dirty_bytes, 1309 .maxlen = sizeof(vm_dirty_bytes), 1310 .mode = 0644, 1311 .proc_handler = dirty_bytes_handler, 1312 .extra1 = &dirty_bytes_min, 1313 }, 1314 { 1315 .procname = "dirty_writeback_centisecs", 1316 .data = &dirty_writeback_interval, 1317 .maxlen = sizeof(dirty_writeback_interval), 1318 .mode = 0644, 1319 .proc_handler = dirty_writeback_centisecs_handler, 1320 }, 1321 { 1322 .procname = "dirty_expire_centisecs", 1323 .data = &dirty_expire_interval, 1324 .maxlen = sizeof(dirty_expire_interval), 1325 .mode = 0644, 1326 .proc_handler = proc_dointvec_minmax, 1327 .extra1 = &zero, 1328 }, 1329 { 1330 .procname = "dirtytime_expire_seconds", 1331 .data = &dirtytime_expire_interval, 1332 .maxlen = sizeof(dirty_expire_interval), 1333 .mode = 0644, 1334 .proc_handler = dirtytime_interval_handler, 1335 .extra1 = &zero, 1336 }, 1337 { 1338 .procname = "swappiness", 1339 .data = &vm_swappiness, 1340 .maxlen = sizeof(vm_swappiness), 1341 .mode = 0644, 1342 .proc_handler = proc_dointvec_minmax, 1343 .extra1 = &zero, 1344 .extra2 = &one_hundred, 1345 }, 1346 #ifdef CONFIG_HUGETLB_PAGE 1347 { 1348 .procname = "nr_hugepages", 1349 .data = NULL, 1350 .maxlen = sizeof(unsigned long), 1351 .mode = 0644, 1352 .proc_handler = hugetlb_sysctl_handler, 1353 }, 1354 #ifdef CONFIG_NUMA 1355 { 1356 .procname = "nr_hugepages_mempolicy", 1357 .data = NULL, 1358 .maxlen = sizeof(unsigned long), 1359 .mode = 0644, 1360 .proc_handler = &hugetlb_mempolicy_sysctl_handler, 1361 }, 1362 { 1363 .procname = "numa_stat", 1364 .data = &sysctl_vm_numa_stat, 1365 .maxlen = sizeof(int), 1366 .mode = 0644, 1367 .proc_handler = sysctl_vm_numa_stat_handler, 1368 .extra1 = &zero, 1369 .extra2 = &one, 1370 }, 1371 #endif 1372 { 1373 .procname = "hugetlb_shm_group", 1374 .data = &sysctl_hugetlb_shm_group, 1375 .maxlen = sizeof(gid_t), 1376 .mode = 0644, 1377 .proc_handler = proc_dointvec, 1378 }, 1379 { 1380 .procname = "nr_overcommit_hugepages", 1381 .data = NULL, 1382 .maxlen = sizeof(unsigned long), 1383 .mode = 0644, 1384 .proc_handler = hugetlb_overcommit_handler, 1385 }, 1386 #endif 1387 { 1388 .procname = "lowmem_reserve_ratio", 1389 .data = &sysctl_lowmem_reserve_ratio, 1390 .maxlen = sizeof(sysctl_lowmem_reserve_ratio), 1391 .mode = 0644, 1392 .proc_handler = lowmem_reserve_ratio_sysctl_handler, 1393 }, 1394 { 1395 .procname = "drop_caches", 1396 .data = &sysctl_drop_caches, 1397 .maxlen = sizeof(int), 1398 .mode = 0644, 1399 .proc_handler = drop_caches_sysctl_handler, 1400 .extra1 = &one, 1401 .extra2 = &four, 1402 }, 1403 #ifdef CONFIG_COMPACTION 1404 { 1405 .procname = "compact_memory", 1406 .data = &sysctl_compact_memory, 1407 .maxlen = sizeof(int), 1408 .mode = 0200, 1409 .proc_handler = sysctl_compaction_handler, 1410 }, 1411 { 1412 .procname = "extfrag_threshold", 1413 .data = &sysctl_extfrag_threshold, 1414 .maxlen = sizeof(int), 1415 .mode = 0644, 1416 .proc_handler = sysctl_extfrag_handler, 1417 .extra1 = &min_extfrag_threshold, 1418 .extra2 = &max_extfrag_threshold, 1419 }, 1420 { 1421 .procname = "compact_unevictable_allowed", 1422 .data = &sysctl_compact_unevictable_allowed, 1423 .maxlen = sizeof(int), 1424 .mode = 0644, 1425 .proc_handler = proc_dointvec, 1426 .extra1 = &zero, 1427 .extra2 = &one, 1428 }, 1429 1430 #endif /* CONFIG_COMPACTION */ 1431 { 1432 .procname = "min_free_kbytes", 1433 .data = &min_free_kbytes, 1434 .maxlen = sizeof(min_free_kbytes), 1435 .mode = 0644, 1436 .proc_handler = min_free_kbytes_sysctl_handler, 1437 .extra1 = &zero, 1438 }, 1439 { 1440 .procname = "watermark_scale_factor", 1441 .data = &watermark_scale_factor, 1442 .maxlen = sizeof(watermark_scale_factor), 1443 .mode = 0644, 1444 .proc_handler = watermark_scale_factor_sysctl_handler, 1445 .extra1 = &one, 1446 .extra2 = &one_thousand, 1447 }, 1448 { 1449 .procname = "percpu_pagelist_fraction", 1450 .data = &percpu_pagelist_fraction, 1451 .maxlen = sizeof(percpu_pagelist_fraction), 1452 .mode = 0644, 1453 .proc_handler = percpu_pagelist_fraction_sysctl_handler, 1454 .extra1 = &zero, 1455 }, 1456 #ifdef CONFIG_MMU 1457 { 1458 .procname = "max_map_count", 1459 .data = &sysctl_max_map_count, 1460 .maxlen = sizeof(sysctl_max_map_count), 1461 .mode = 0644, 1462 .proc_handler = proc_dointvec_minmax, 1463 .extra1 = &zero, 1464 }, 1465 #else 1466 { 1467 .procname = "nr_trim_pages", 1468 .data = &sysctl_nr_trim_pages, 1469 .maxlen = sizeof(sysctl_nr_trim_pages), 1470 .mode = 0644, 1471 .proc_handler = proc_dointvec_minmax, 1472 .extra1 = &zero, 1473 }, 1474 #endif 1475 { 1476 .procname = "laptop_mode", 1477 .data = &laptop_mode, 1478 .maxlen = sizeof(laptop_mode), 1479 .mode = 0644, 1480 .proc_handler = proc_dointvec_jiffies, 1481 }, 1482 { 1483 .procname = "block_dump", 1484 .data = &block_dump, 1485 .maxlen = sizeof(block_dump), 1486 .mode = 0644, 1487 .proc_handler = proc_dointvec, 1488 .extra1 = &zero, 1489 }, 1490 { 1491 .procname = "vfs_cache_pressure", 1492 .data = &sysctl_vfs_cache_pressure, 1493 .maxlen = sizeof(sysctl_vfs_cache_pressure), 1494 .mode = 0644, 1495 .proc_handler = proc_dointvec, 1496 .extra1 = &zero, 1497 }, 1498 #ifdef HAVE_ARCH_PICK_MMAP_LAYOUT 1499 { 1500 .procname = "legacy_va_layout", 1501 .data = &sysctl_legacy_va_layout, 1502 .maxlen = sizeof(sysctl_legacy_va_layout), 1503 .mode = 0644, 1504 .proc_handler = proc_dointvec, 1505 .extra1 = &zero, 1506 }, 1507 #endif 1508 #ifdef CONFIG_NUMA 1509 { 1510 .procname = "zone_reclaim_mode", 1511 .data = &node_reclaim_mode, 1512 .maxlen = sizeof(node_reclaim_mode), 1513 .mode = 0644, 1514 .proc_handler = proc_dointvec, 1515 .extra1 = &zero, 1516 }, 1517 { 1518 .procname = "min_unmapped_ratio", 1519 .data = &sysctl_min_unmapped_ratio, 1520 .maxlen = sizeof(sysctl_min_unmapped_ratio), 1521 .mode = 0644, 1522 .proc_handler = sysctl_min_unmapped_ratio_sysctl_handler, 1523 .extra1 = &zero, 1524 .extra2 = &one_hundred, 1525 }, 1526 { 1527 .procname = "min_slab_ratio", 1528 .data = &sysctl_min_slab_ratio, 1529 .maxlen = sizeof(sysctl_min_slab_ratio), 1530 .mode = 0644, 1531 .proc_handler = sysctl_min_slab_ratio_sysctl_handler, 1532 .extra1 = &zero, 1533 .extra2 = &one_hundred, 1534 }, 1535 #endif 1536 #ifdef CONFIG_SMP 1537 { 1538 .procname = "stat_interval", 1539 .data = &sysctl_stat_interval, 1540 .maxlen = sizeof(sysctl_stat_interval), 1541 .mode = 0644, 1542 .proc_handler = proc_dointvec_jiffies, 1543 }, 1544 { 1545 .procname = "stat_refresh", 1546 .data = NULL, 1547 .maxlen = 0, 1548 .mode = 0600, 1549 .proc_handler = vmstat_refresh, 1550 }, 1551 #endif 1552 #ifdef CONFIG_MMU 1553 { 1554 .procname = "mmap_min_addr", 1555 .data = &dac_mmap_min_addr, 1556 .maxlen = sizeof(unsigned long), 1557 .mode = 0644, 1558 .proc_handler = mmap_min_addr_handler, 1559 }, 1560 #endif 1561 #ifdef CONFIG_NUMA 1562 { 1563 .procname = "numa_zonelist_order", 1564 .data = &numa_zonelist_order, 1565 .maxlen = NUMA_ZONELIST_ORDER_LEN, 1566 .mode = 0644, 1567 .proc_handler = numa_zonelist_order_handler, 1568 }, 1569 #endif 1570 #if (defined(CONFIG_X86_32) && !defined(CONFIG_UML))|| \ 1571 (defined(CONFIG_SUPERH) && defined(CONFIG_VSYSCALL)) 1572 { 1573 .procname = "vdso_enabled", 1574 #ifdef CONFIG_X86_32 1575 .data = &vdso32_enabled, 1576 .maxlen = sizeof(vdso32_enabled), 1577 #else 1578 .data = &vdso_enabled, 1579 .maxlen = sizeof(vdso_enabled), 1580 #endif 1581 .mode = 0644, 1582 .proc_handler = proc_dointvec, 1583 .extra1 = &zero, 1584 }, 1585 #endif 1586 #ifdef CONFIG_HIGHMEM 1587 { 1588 .procname = "highmem_is_dirtyable", 1589 .data = &vm_highmem_is_dirtyable, 1590 .maxlen = sizeof(vm_highmem_is_dirtyable), 1591 .mode = 0644, 1592 .proc_handler = proc_dointvec_minmax, 1593 .extra1 = &zero, 1594 .extra2 = &one, 1595 }, 1596 #endif 1597 #ifdef CONFIG_MEMORY_FAILURE 1598 { 1599 .procname = "memory_failure_early_kill", 1600 .data = &sysctl_memory_failure_early_kill, 1601 .maxlen = sizeof(sysctl_memory_failure_early_kill), 1602 .mode = 0644, 1603 .proc_handler = proc_dointvec_minmax, 1604 .extra1 = &zero, 1605 .extra2 = &one, 1606 }, 1607 { 1608 .procname = "memory_failure_recovery", 1609 .data = &sysctl_memory_failure_recovery, 1610 .maxlen = sizeof(sysctl_memory_failure_recovery), 1611 .mode = 0644, 1612 .proc_handler = proc_dointvec_minmax, 1613 .extra1 = &zero, 1614 .extra2 = &one, 1615 }, 1616 #endif 1617 { 1618 .procname = "user_reserve_kbytes", 1619 .data = &sysctl_user_reserve_kbytes, 1620 .maxlen = sizeof(sysctl_user_reserve_kbytes), 1621 .mode = 0644, 1622 .proc_handler = proc_doulongvec_minmax, 1623 }, 1624 { 1625 .procname = "admin_reserve_kbytes", 1626 .data = &sysctl_admin_reserve_kbytes, 1627 .maxlen = sizeof(sysctl_admin_reserve_kbytes), 1628 .mode = 0644, 1629 .proc_handler = proc_doulongvec_minmax, 1630 }, 1631 #ifdef CONFIG_HAVE_ARCH_MMAP_RND_BITS 1632 { 1633 .procname = "mmap_rnd_bits", 1634 .data = &mmap_rnd_bits, 1635 .maxlen = sizeof(mmap_rnd_bits), 1636 .mode = 0600, 1637 .proc_handler = proc_dointvec_minmax, 1638 .extra1 = (void *)&mmap_rnd_bits_min, 1639 .extra2 = (void *)&mmap_rnd_bits_max, 1640 }, 1641 #endif 1642 #ifdef CONFIG_HAVE_ARCH_MMAP_RND_COMPAT_BITS 1643 { 1644 .procname = "mmap_rnd_compat_bits", 1645 .data = &mmap_rnd_compat_bits, 1646 .maxlen = sizeof(mmap_rnd_compat_bits), 1647 .mode = 0600, 1648 .proc_handler = proc_dointvec_minmax, 1649 .extra1 = (void *)&mmap_rnd_compat_bits_min, 1650 .extra2 = (void *)&mmap_rnd_compat_bits_max, 1651 }, 1652 #endif 1653 { } 1654 }; 1655 1656 static struct ctl_table fs_table[] = { 1657 { 1658 .procname = "inode-nr", 1659 .data = &inodes_stat, 1660 .maxlen = 2*sizeof(long), 1661 .mode = 0444, 1662 .proc_handler = proc_nr_inodes, 1663 }, 1664 { 1665 .procname = "inode-state", 1666 .data = &inodes_stat, 1667 .maxlen = 7*sizeof(long), 1668 .mode = 0444, 1669 .proc_handler = proc_nr_inodes, 1670 }, 1671 { 1672 .procname = "file-nr", 1673 .data = &files_stat, 1674 .maxlen = sizeof(files_stat), 1675 .mode = 0444, 1676 .proc_handler = proc_nr_files, 1677 }, 1678 { 1679 .procname = "file-max", 1680 .data = &files_stat.max_files, 1681 .maxlen = sizeof(files_stat.max_files), 1682 .mode = 0644, 1683 .proc_handler = proc_doulongvec_minmax, 1684 }, 1685 { 1686 .procname = "nr_open", 1687 .data = &sysctl_nr_open, 1688 .maxlen = sizeof(unsigned int), 1689 .mode = 0644, 1690 .proc_handler = proc_dointvec_minmax, 1691 .extra1 = &sysctl_nr_open_min, 1692 .extra2 = &sysctl_nr_open_max, 1693 }, 1694 { 1695 .procname = "dentry-state", 1696 .data = &dentry_stat, 1697 .maxlen = 6*sizeof(long), 1698 .mode = 0444, 1699 .proc_handler = proc_nr_dentry, 1700 }, 1701 { 1702 .procname = "overflowuid", 1703 .data = &fs_overflowuid, 1704 .maxlen = sizeof(int), 1705 .mode = 0644, 1706 .proc_handler = proc_dointvec_minmax, 1707 .extra1 = &minolduid, 1708 .extra2 = &maxolduid, 1709 }, 1710 { 1711 .procname = "overflowgid", 1712 .data = &fs_overflowgid, 1713 .maxlen = sizeof(int), 1714 .mode = 0644, 1715 .proc_handler = proc_dointvec_minmax, 1716 .extra1 = &minolduid, 1717 .extra2 = &maxolduid, 1718 }, 1719 #ifdef CONFIG_FILE_LOCKING 1720 { 1721 .procname = "leases-enable", 1722 .data = &leases_enable, 1723 .maxlen = sizeof(int), 1724 .mode = 0644, 1725 .proc_handler = proc_dointvec, 1726 }, 1727 #endif 1728 #ifdef CONFIG_DNOTIFY 1729 { 1730 .procname = "dir-notify-enable", 1731 .data = &dir_notify_enable, 1732 .maxlen = sizeof(int), 1733 .mode = 0644, 1734 .proc_handler = proc_dointvec, 1735 }, 1736 #endif 1737 #ifdef CONFIG_MMU 1738 #ifdef CONFIG_FILE_LOCKING 1739 { 1740 .procname = "lease-break-time", 1741 .data = &lease_break_time, 1742 .maxlen = sizeof(int), 1743 .mode = 0644, 1744 .proc_handler = proc_dointvec, 1745 }, 1746 #endif 1747 #ifdef CONFIG_AIO 1748 { 1749 .procname = "aio-nr", 1750 .data = &aio_nr, 1751 .maxlen = sizeof(aio_nr), 1752 .mode = 0444, 1753 .proc_handler = proc_doulongvec_minmax, 1754 }, 1755 { 1756 .procname = "aio-max-nr", 1757 .data = &aio_max_nr, 1758 .maxlen = sizeof(aio_max_nr), 1759 .mode = 0644, 1760 .proc_handler = proc_doulongvec_minmax, 1761 }, 1762 #endif /* CONFIG_AIO */ 1763 #ifdef CONFIG_INOTIFY_USER 1764 { 1765 .procname = "inotify", 1766 .mode = 0555, 1767 .child = inotify_table, 1768 }, 1769 #endif 1770 #ifdef CONFIG_EPOLL 1771 { 1772 .procname = "epoll", 1773 .mode = 0555, 1774 .child = epoll_table, 1775 }, 1776 #endif 1777 #endif 1778 { 1779 .procname = "protected_symlinks", 1780 .data = &sysctl_protected_symlinks, 1781 .maxlen = sizeof(int), 1782 .mode = 0600, 1783 .proc_handler = proc_dointvec_minmax, 1784 .extra1 = &zero, 1785 .extra2 = &one, 1786 }, 1787 { 1788 .procname = "protected_hardlinks", 1789 .data = &sysctl_protected_hardlinks, 1790 .maxlen = sizeof(int), 1791 .mode = 0600, 1792 .proc_handler = proc_dointvec_minmax, 1793 .extra1 = &zero, 1794 .extra2 = &one, 1795 }, 1796 { 1797 .procname = "suid_dumpable", 1798 .data = &suid_dumpable, 1799 .maxlen = sizeof(int), 1800 .mode = 0644, 1801 .proc_handler = proc_dointvec_minmax_coredump, 1802 .extra1 = &zero, 1803 .extra2 = &two, 1804 }, 1805 #if defined(CONFIG_BINFMT_MISC) || defined(CONFIG_BINFMT_MISC_MODULE) 1806 { 1807 .procname = "binfmt_misc", 1808 .mode = 0555, 1809 .child = sysctl_mount_point, 1810 }, 1811 #endif 1812 { 1813 .procname = "pipe-max-size", 1814 .data = &pipe_max_size, 1815 .maxlen = sizeof(pipe_max_size), 1816 .mode = 0644, 1817 .proc_handler = proc_dopipe_max_size, 1818 }, 1819 { 1820 .procname = "pipe-user-pages-hard", 1821 .data = &pipe_user_pages_hard, 1822 .maxlen = sizeof(pipe_user_pages_hard), 1823 .mode = 0644, 1824 .proc_handler = proc_doulongvec_minmax, 1825 }, 1826 { 1827 .procname = "pipe-user-pages-soft", 1828 .data = &pipe_user_pages_soft, 1829 .maxlen = sizeof(pipe_user_pages_soft), 1830 .mode = 0644, 1831 .proc_handler = proc_doulongvec_minmax, 1832 }, 1833 { 1834 .procname = "mount-max", 1835 .data = &sysctl_mount_max, 1836 .maxlen = sizeof(unsigned int), 1837 .mode = 0644, 1838 .proc_handler = proc_dointvec_minmax, 1839 .extra1 = &one, 1840 }, 1841 { } 1842 }; 1843 1844 static struct ctl_table debug_table[] = { 1845 #ifdef CONFIG_SYSCTL_EXCEPTION_TRACE 1846 { 1847 .procname = "exception-trace", 1848 .data = &show_unhandled_signals, 1849 .maxlen = sizeof(int), 1850 .mode = 0644, 1851 .proc_handler = proc_dointvec 1852 }, 1853 #endif 1854 #if defined(CONFIG_OPTPROBES) 1855 { 1856 .procname = "kprobes-optimization", 1857 .data = &sysctl_kprobes_optimization, 1858 .maxlen = sizeof(int), 1859 .mode = 0644, 1860 .proc_handler = proc_kprobes_optimization_handler, 1861 .extra1 = &zero, 1862 .extra2 = &one, 1863 }, 1864 #endif 1865 { } 1866 }; 1867 1868 static struct ctl_table dev_table[] = { 1869 { } 1870 }; 1871 1872 int __init sysctl_init(void) 1873 { 1874 struct ctl_table_header *hdr; 1875 1876 hdr = register_sysctl_table(sysctl_base_table); 1877 kmemleak_not_leak(hdr); 1878 return 0; 1879 } 1880 1881 #endif /* CONFIG_SYSCTL */ 1882 1883 /* 1884 * /proc/sys support 1885 */ 1886 1887 #ifdef CONFIG_PROC_SYSCTL 1888 1889 static int _proc_do_string(char *data, int maxlen, int write, 1890 char __user *buffer, 1891 size_t *lenp, loff_t *ppos) 1892 { 1893 size_t len; 1894 char __user *p; 1895 char c; 1896 1897 if (!data || !maxlen || !*lenp) { 1898 *lenp = 0; 1899 return 0; 1900 } 1901 1902 if (write) { 1903 if (sysctl_writes_strict == SYSCTL_WRITES_STRICT) { 1904 /* Only continue writes not past the end of buffer. */ 1905 len = strlen(data); 1906 if (len > maxlen - 1) 1907 len = maxlen - 1; 1908 1909 if (*ppos > len) 1910 return 0; 1911 len = *ppos; 1912 } else { 1913 /* Start writing from beginning of buffer. */ 1914 len = 0; 1915 } 1916 1917 *ppos += *lenp; 1918 p = buffer; 1919 while ((p - buffer) < *lenp && len < maxlen - 1) { 1920 if (get_user(c, p++)) 1921 return -EFAULT; 1922 if (c == 0 || c == '\n') 1923 break; 1924 data[len++] = c; 1925 } 1926 data[len] = 0; 1927 } else { 1928 len = strlen(data); 1929 if (len > maxlen) 1930 len = maxlen; 1931 1932 if (*ppos > len) { 1933 *lenp = 0; 1934 return 0; 1935 } 1936 1937 data += *ppos; 1938 len -= *ppos; 1939 1940 if (len > *lenp) 1941 len = *lenp; 1942 if (len) 1943 if (copy_to_user(buffer, data, len)) 1944 return -EFAULT; 1945 if (len < *lenp) { 1946 if (put_user('\n', buffer + len)) 1947 return -EFAULT; 1948 len++; 1949 } 1950 *lenp = len; 1951 *ppos += len; 1952 } 1953 return 0; 1954 } 1955 1956 static void warn_sysctl_write(struct ctl_table *table) 1957 { 1958 pr_warn_once("%s wrote to %s when file position was not 0!\n" 1959 "This will not be supported in the future. To silence this\n" 1960 "warning, set kernel.sysctl_writes_strict = -1\n", 1961 current->comm, table->procname); 1962 } 1963 1964 /** 1965 * proc_first_pos_non_zero_ignore - check if firs position is allowed 1966 * @ppos: file position 1967 * @table: the sysctl table 1968 * 1969 * Returns true if the first position is non-zero and the sysctl_writes_strict 1970 * mode indicates this is not allowed for numeric input types. String proc 1971 * hadlers can ignore the return value. 1972 */ 1973 static bool proc_first_pos_non_zero_ignore(loff_t *ppos, 1974 struct ctl_table *table) 1975 { 1976 if (!*ppos) 1977 return false; 1978 1979 switch (sysctl_writes_strict) { 1980 case SYSCTL_WRITES_STRICT: 1981 return true; 1982 case SYSCTL_WRITES_WARN: 1983 warn_sysctl_write(table); 1984 return false; 1985 default: 1986 return false; 1987 } 1988 } 1989 1990 /** 1991 * proc_dostring - read a string sysctl 1992 * @table: the sysctl table 1993 * @write: %TRUE if this is a write to the sysctl file 1994 * @buffer: the user buffer 1995 * @lenp: the size of the user buffer 1996 * @ppos: file position 1997 * 1998 * Reads/writes a string from/to the user buffer. If the kernel 1999 * buffer provided is not large enough to hold the string, the 2000 * string is truncated. The copied string is %NULL-terminated. 2001 * If the string is being read by the user process, it is copied 2002 * and a newline '\n' is added. It is truncated if the buffer is 2003 * not large enough. 2004 * 2005 * Returns 0 on success. 2006 */ 2007 int proc_dostring(struct ctl_table *table, int write, 2008 void __user *buffer, size_t *lenp, loff_t *ppos) 2009 { 2010 if (write) 2011 proc_first_pos_non_zero_ignore(ppos, table); 2012 2013 return _proc_do_string((char *)(table->data), table->maxlen, write, 2014 (char __user *)buffer, lenp, ppos); 2015 } 2016 2017 static size_t proc_skip_spaces(char **buf) 2018 { 2019 size_t ret; 2020 char *tmp = skip_spaces(*buf); 2021 ret = tmp - *buf; 2022 *buf = tmp; 2023 return ret; 2024 } 2025 2026 static void proc_skip_char(char **buf, size_t *size, const char v) 2027 { 2028 while (*size) { 2029 if (**buf != v) 2030 break; 2031 (*size)--; 2032 (*buf)++; 2033 } 2034 } 2035 2036 #define TMPBUFLEN 22 2037 /** 2038 * proc_get_long - reads an ASCII formatted integer from a user buffer 2039 * 2040 * @buf: a kernel buffer 2041 * @size: size of the kernel buffer 2042 * @val: this is where the number will be stored 2043 * @neg: set to %TRUE if number is negative 2044 * @perm_tr: a vector which contains the allowed trailers 2045 * @perm_tr_len: size of the perm_tr vector 2046 * @tr: pointer to store the trailer character 2047 * 2048 * In case of success %0 is returned and @buf and @size are updated with 2049 * the amount of bytes read. If @tr is non-NULL and a trailing 2050 * character exists (size is non-zero after returning from this 2051 * function), @tr is updated with the trailing character. 2052 */ 2053 static int proc_get_long(char **buf, size_t *size, 2054 unsigned long *val, bool *neg, 2055 const char *perm_tr, unsigned perm_tr_len, char *tr) 2056 { 2057 int len; 2058 char *p, tmp[TMPBUFLEN]; 2059 2060 if (!*size) 2061 return -EINVAL; 2062 2063 len = *size; 2064 if (len > TMPBUFLEN - 1) 2065 len = TMPBUFLEN - 1; 2066 2067 memcpy(tmp, *buf, len); 2068 2069 tmp[len] = 0; 2070 p = tmp; 2071 if (*p == '-' && *size > 1) { 2072 *neg = true; 2073 p++; 2074 } else 2075 *neg = false; 2076 if (!isdigit(*p)) 2077 return -EINVAL; 2078 2079 *val = simple_strtoul(p, &p, 0); 2080 2081 len = p - tmp; 2082 2083 /* We don't know if the next char is whitespace thus we may accept 2084 * invalid integers (e.g. 1234...a) or two integers instead of one 2085 * (e.g. 123...1). So lets not allow such large numbers. */ 2086 if (len == TMPBUFLEN - 1) 2087 return -EINVAL; 2088 2089 if (len < *size && perm_tr_len && !memchr(perm_tr, *p, perm_tr_len)) 2090 return -EINVAL; 2091 2092 if (tr && (len < *size)) 2093 *tr = *p; 2094 2095 *buf += len; 2096 *size -= len; 2097 2098 return 0; 2099 } 2100 2101 /** 2102 * proc_put_long - converts an integer to a decimal ASCII formatted string 2103 * 2104 * @buf: the user buffer 2105 * @size: the size of the user buffer 2106 * @val: the integer to be converted 2107 * @neg: sign of the number, %TRUE for negative 2108 * 2109 * In case of success %0 is returned and @buf and @size are updated with 2110 * the amount of bytes written. 2111 */ 2112 static int proc_put_long(void __user **buf, size_t *size, unsigned long val, 2113 bool neg) 2114 { 2115 int len; 2116 char tmp[TMPBUFLEN], *p = tmp; 2117 2118 sprintf(p, "%s%lu", neg ? "-" : "", val); 2119 len = strlen(tmp); 2120 if (len > *size) 2121 len = *size; 2122 if (copy_to_user(*buf, tmp, len)) 2123 return -EFAULT; 2124 *size -= len; 2125 *buf += len; 2126 return 0; 2127 } 2128 #undef TMPBUFLEN 2129 2130 static int proc_put_char(void __user **buf, size_t *size, char c) 2131 { 2132 if (*size) { 2133 char __user **buffer = (char __user **)buf; 2134 if (put_user(c, *buffer)) 2135 return -EFAULT; 2136 (*size)--, (*buffer)++; 2137 *buf = *buffer; 2138 } 2139 return 0; 2140 } 2141 2142 static int do_proc_dointvec_conv(bool *negp, unsigned long *lvalp, 2143 int *valp, 2144 int write, void *data) 2145 { 2146 if (write) { 2147 if (*negp) { 2148 if (*lvalp > (unsigned long) INT_MAX + 1) 2149 return -EINVAL; 2150 *valp = -*lvalp; 2151 } else { 2152 if (*lvalp > (unsigned long) INT_MAX) 2153 return -EINVAL; 2154 *valp = *lvalp; 2155 } 2156 } else { 2157 int val = *valp; 2158 if (val < 0) { 2159 *negp = true; 2160 *lvalp = -(unsigned long)val; 2161 } else { 2162 *negp = false; 2163 *lvalp = (unsigned long)val; 2164 } 2165 } 2166 return 0; 2167 } 2168 2169 static int do_proc_douintvec_conv(unsigned long *lvalp, 2170 unsigned int *valp, 2171 int write, void *data) 2172 { 2173 if (write) { 2174 if (*lvalp > UINT_MAX) 2175 return -EINVAL; 2176 *valp = *lvalp; 2177 } else { 2178 unsigned int val = *valp; 2179 *lvalp = (unsigned long)val; 2180 } 2181 return 0; 2182 } 2183 2184 static const char proc_wspace_sep[] = { ' ', '\t', '\n' }; 2185 2186 static int __do_proc_dointvec(void *tbl_data, struct ctl_table *table, 2187 int write, void __user *buffer, 2188 size_t *lenp, loff_t *ppos, 2189 int (*conv)(bool *negp, unsigned long *lvalp, int *valp, 2190 int write, void *data), 2191 void *data) 2192 { 2193 int *i, vleft, first = 1, err = 0; 2194 size_t left; 2195 char *kbuf = NULL, *p; 2196 2197 if (!tbl_data || !table->maxlen || !*lenp || (*ppos && !write)) { 2198 *lenp = 0; 2199 return 0; 2200 } 2201 2202 i = (int *) tbl_data; 2203 vleft = table->maxlen / sizeof(*i); 2204 left = *lenp; 2205 2206 if (!conv) 2207 conv = do_proc_dointvec_conv; 2208 2209 if (write) { 2210 if (proc_first_pos_non_zero_ignore(ppos, table)) 2211 goto out; 2212 2213 if (left > PAGE_SIZE - 1) 2214 left = PAGE_SIZE - 1; 2215 p = kbuf = memdup_user_nul(buffer, left); 2216 if (IS_ERR(kbuf)) 2217 return PTR_ERR(kbuf); 2218 } 2219 2220 for (; left && vleft--; i++, first=0) { 2221 unsigned long lval; 2222 bool neg; 2223 2224 if (write) { 2225 left -= proc_skip_spaces(&p); 2226 2227 if (!left) 2228 break; 2229 err = proc_get_long(&p, &left, &lval, &neg, 2230 proc_wspace_sep, 2231 sizeof(proc_wspace_sep), NULL); 2232 if (err) 2233 break; 2234 if (conv(&neg, &lval, i, 1, data)) { 2235 err = -EINVAL; 2236 break; 2237 } 2238 } else { 2239 if (conv(&neg, &lval, i, 0, data)) { 2240 err = -EINVAL; 2241 break; 2242 } 2243 if (!first) 2244 err = proc_put_char(&buffer, &left, '\t'); 2245 if (err) 2246 break; 2247 err = proc_put_long(&buffer, &left, lval, neg); 2248 if (err) 2249 break; 2250 } 2251 } 2252 2253 if (!write && !first && left && !err) 2254 err = proc_put_char(&buffer, &left, '\n'); 2255 if (write && !err && left) 2256 left -= proc_skip_spaces(&p); 2257 if (write) { 2258 kfree(kbuf); 2259 if (first) 2260 return err ? : -EINVAL; 2261 } 2262 *lenp -= left; 2263 out: 2264 *ppos += *lenp; 2265 return err; 2266 } 2267 2268 static int do_proc_dointvec(struct ctl_table *table, int write, 2269 void __user *buffer, size_t *lenp, loff_t *ppos, 2270 int (*conv)(bool *negp, unsigned long *lvalp, int *valp, 2271 int write, void *data), 2272 void *data) 2273 { 2274 return __do_proc_dointvec(table->data, table, write, 2275 buffer, lenp, ppos, conv, data); 2276 } 2277 2278 static int do_proc_douintvec_w(unsigned int *tbl_data, 2279 struct ctl_table *table, 2280 void __user *buffer, 2281 size_t *lenp, loff_t *ppos, 2282 int (*conv)(unsigned long *lvalp, 2283 unsigned int *valp, 2284 int write, void *data), 2285 void *data) 2286 { 2287 unsigned long lval; 2288 int err = 0; 2289 size_t left; 2290 bool neg; 2291 char *kbuf = NULL, *p; 2292 2293 left = *lenp; 2294 2295 if (proc_first_pos_non_zero_ignore(ppos, table)) 2296 goto bail_early; 2297 2298 if (left > PAGE_SIZE - 1) 2299 left = PAGE_SIZE - 1; 2300 2301 p = kbuf = memdup_user_nul(buffer, left); 2302 if (IS_ERR(kbuf)) 2303 return -EINVAL; 2304 2305 left -= proc_skip_spaces(&p); 2306 if (!left) { 2307 err = -EINVAL; 2308 goto out_free; 2309 } 2310 2311 err = proc_get_long(&p, &left, &lval, &neg, 2312 proc_wspace_sep, 2313 sizeof(proc_wspace_sep), NULL); 2314 if (err || neg) { 2315 err = -EINVAL; 2316 goto out_free; 2317 } 2318 2319 if (conv(&lval, tbl_data, 1, data)) { 2320 err = -EINVAL; 2321 goto out_free; 2322 } 2323 2324 if (!err && left) 2325 left -= proc_skip_spaces(&p); 2326 2327 out_free: 2328 kfree(kbuf); 2329 if (err) 2330 return -EINVAL; 2331 2332 return 0; 2333 2334 /* This is in keeping with old __do_proc_dointvec() */ 2335 bail_early: 2336 *ppos += *lenp; 2337 return err; 2338 } 2339 2340 static int do_proc_douintvec_r(unsigned int *tbl_data, void __user *buffer, 2341 size_t *lenp, loff_t *ppos, 2342 int (*conv)(unsigned long *lvalp, 2343 unsigned int *valp, 2344 int write, void *data), 2345 void *data) 2346 { 2347 unsigned long lval; 2348 int err = 0; 2349 size_t left; 2350 2351 left = *lenp; 2352 2353 if (conv(&lval, tbl_data, 0, data)) { 2354 err = -EINVAL; 2355 goto out; 2356 } 2357 2358 err = proc_put_long(&buffer, &left, lval, false); 2359 if (err || !left) 2360 goto out; 2361 2362 err = proc_put_char(&buffer, &left, '\n'); 2363 2364 out: 2365 *lenp -= left; 2366 *ppos += *lenp; 2367 2368 return err; 2369 } 2370 2371 static int __do_proc_douintvec(void *tbl_data, struct ctl_table *table, 2372 int write, void __user *buffer, 2373 size_t *lenp, loff_t *ppos, 2374 int (*conv)(unsigned long *lvalp, 2375 unsigned int *valp, 2376 int write, void *data), 2377 void *data) 2378 { 2379 unsigned int *i, vleft; 2380 2381 if (!tbl_data || !table->maxlen || !*lenp || (*ppos && !write)) { 2382 *lenp = 0; 2383 return 0; 2384 } 2385 2386 i = (unsigned int *) tbl_data; 2387 vleft = table->maxlen / sizeof(*i); 2388 2389 /* 2390 * Arrays are not supported, keep this simple. *Do not* add 2391 * support for them. 2392 */ 2393 if (vleft != 1) { 2394 *lenp = 0; 2395 return -EINVAL; 2396 } 2397 2398 if (!conv) 2399 conv = do_proc_douintvec_conv; 2400 2401 if (write) 2402 return do_proc_douintvec_w(i, table, buffer, lenp, ppos, 2403 conv, data); 2404 return do_proc_douintvec_r(i, buffer, lenp, ppos, conv, data); 2405 } 2406 2407 static int do_proc_douintvec(struct ctl_table *table, int write, 2408 void __user *buffer, size_t *lenp, loff_t *ppos, 2409 int (*conv)(unsigned long *lvalp, 2410 unsigned int *valp, 2411 int write, void *data), 2412 void *data) 2413 { 2414 return __do_proc_douintvec(table->data, table, write, 2415 buffer, lenp, ppos, conv, data); 2416 } 2417 2418 /** 2419 * proc_dointvec - read a vector of integers 2420 * @table: the sysctl table 2421 * @write: %TRUE if this is a write to the sysctl file 2422 * @buffer: the user buffer 2423 * @lenp: the size of the user buffer 2424 * @ppos: file position 2425 * 2426 * Reads/writes up to table->maxlen/sizeof(unsigned int) integer 2427 * values from/to the user buffer, treated as an ASCII string. 2428 * 2429 * Returns 0 on success. 2430 */ 2431 int proc_dointvec(struct ctl_table *table, int write, 2432 void __user *buffer, size_t *lenp, loff_t *ppos) 2433 { 2434 return do_proc_dointvec(table, write, buffer, lenp, ppos, NULL, NULL); 2435 } 2436 2437 /** 2438 * proc_douintvec - read a vector of unsigned integers 2439 * @table: the sysctl table 2440 * @write: %TRUE if this is a write to the sysctl file 2441 * @buffer: the user buffer 2442 * @lenp: the size of the user buffer 2443 * @ppos: file position 2444 * 2445 * Reads/writes up to table->maxlen/sizeof(unsigned int) unsigned integer 2446 * values from/to the user buffer, treated as an ASCII string. 2447 * 2448 * Returns 0 on success. 2449 */ 2450 int proc_douintvec(struct ctl_table *table, int write, 2451 void __user *buffer, size_t *lenp, loff_t *ppos) 2452 { 2453 return do_proc_douintvec(table, write, buffer, lenp, ppos, 2454 do_proc_douintvec_conv, NULL); 2455 } 2456 2457 /* 2458 * Taint values can only be increased 2459 * This means we can safely use a temporary. 2460 */ 2461 static int proc_taint(struct ctl_table *table, int write, 2462 void __user *buffer, size_t *lenp, loff_t *ppos) 2463 { 2464 struct ctl_table t; 2465 unsigned long tmptaint = get_taint(); 2466 int err; 2467 2468 if (write && !capable(CAP_SYS_ADMIN)) 2469 return -EPERM; 2470 2471 t = *table; 2472 t.data = &tmptaint; 2473 err = proc_doulongvec_minmax(&t, write, buffer, lenp, ppos); 2474 if (err < 0) 2475 return err; 2476 2477 if (write) { 2478 /* 2479 * Poor man's atomic or. Not worth adding a primitive 2480 * to everyone's atomic.h for this 2481 */ 2482 int i; 2483 for (i = 0; i < BITS_PER_LONG && tmptaint >> i; i++) { 2484 if ((tmptaint >> i) & 1) 2485 add_taint(i, LOCKDEP_STILL_OK); 2486 } 2487 } 2488 2489 return err; 2490 } 2491 2492 #ifdef CONFIG_PRINTK 2493 static int proc_dointvec_minmax_sysadmin(struct ctl_table *table, int write, 2494 void __user *buffer, size_t *lenp, loff_t *ppos) 2495 { 2496 if (write && !capable(CAP_SYS_ADMIN)) 2497 return -EPERM; 2498 2499 return proc_dointvec_minmax(table, write, buffer, lenp, ppos); 2500 } 2501 #endif 2502 2503 struct do_proc_dointvec_minmax_conv_param { 2504 int *min; 2505 int *max; 2506 }; 2507 2508 static int do_proc_dointvec_minmax_conv(bool *negp, unsigned long *lvalp, 2509 int *valp, 2510 int write, void *data) 2511 { 2512 struct do_proc_dointvec_minmax_conv_param *param = data; 2513 if (write) { 2514 int val = *negp ? -*lvalp : *lvalp; 2515 if ((param->min && *param->min > val) || 2516 (param->max && *param->max < val)) 2517 return -EINVAL; 2518 *valp = val; 2519 } else { 2520 int val = *valp; 2521 if (val < 0) { 2522 *negp = true; 2523 *lvalp = -(unsigned long)val; 2524 } else { 2525 *negp = false; 2526 *lvalp = (unsigned long)val; 2527 } 2528 } 2529 return 0; 2530 } 2531 2532 /** 2533 * proc_dointvec_minmax - read a vector of integers with min/max values 2534 * @table: the sysctl table 2535 * @write: %TRUE if this is a write to the sysctl file 2536 * @buffer: the user buffer 2537 * @lenp: the size of the user buffer 2538 * @ppos: file position 2539 * 2540 * Reads/writes up to table->maxlen/sizeof(unsigned int) integer 2541 * values from/to the user buffer, treated as an ASCII string. 2542 * 2543 * This routine will ensure the values are within the range specified by 2544 * table->extra1 (min) and table->extra2 (max). 2545 * 2546 * Returns 0 on success. 2547 */ 2548 int proc_dointvec_minmax(struct ctl_table *table, int write, 2549 void __user *buffer, size_t *lenp, loff_t *ppos) 2550 { 2551 struct do_proc_dointvec_minmax_conv_param param = { 2552 .min = (int *) table->extra1, 2553 .max = (int *) table->extra2, 2554 }; 2555 return do_proc_dointvec(table, write, buffer, lenp, ppos, 2556 do_proc_dointvec_minmax_conv, ¶m); 2557 } 2558 2559 struct do_proc_douintvec_minmax_conv_param { 2560 unsigned int *min; 2561 unsigned int *max; 2562 }; 2563 2564 static int do_proc_douintvec_minmax_conv(unsigned long *lvalp, 2565 unsigned int *valp, 2566 int write, void *data) 2567 { 2568 struct do_proc_douintvec_minmax_conv_param *param = data; 2569 2570 if (write) { 2571 unsigned int val = *lvalp; 2572 2573 if (*lvalp > UINT_MAX) 2574 return -EINVAL; 2575 2576 if ((param->min && *param->min > val) || 2577 (param->max && *param->max < val)) 2578 return -ERANGE; 2579 2580 *valp = val; 2581 } else { 2582 unsigned int val = *valp; 2583 *lvalp = (unsigned long) val; 2584 } 2585 2586 return 0; 2587 } 2588 2589 /** 2590 * proc_douintvec_minmax - read a vector of unsigned ints with min/max values 2591 * @table: the sysctl table 2592 * @write: %TRUE if this is a write to the sysctl file 2593 * @buffer: the user buffer 2594 * @lenp: the size of the user buffer 2595 * @ppos: file position 2596 * 2597 * Reads/writes up to table->maxlen/sizeof(unsigned int) unsigned integer 2598 * values from/to the user buffer, treated as an ASCII string. Negative 2599 * strings are not allowed. 2600 * 2601 * This routine will ensure the values are within the range specified by 2602 * table->extra1 (min) and table->extra2 (max). There is a final sanity 2603 * check for UINT_MAX to avoid having to support wrap around uses from 2604 * userspace. 2605 * 2606 * Returns 0 on success. 2607 */ 2608 int proc_douintvec_minmax(struct ctl_table *table, int write, 2609 void __user *buffer, size_t *lenp, loff_t *ppos) 2610 { 2611 struct do_proc_douintvec_minmax_conv_param param = { 2612 .min = (unsigned int *) table->extra1, 2613 .max = (unsigned int *) table->extra2, 2614 }; 2615 return do_proc_douintvec(table, write, buffer, lenp, ppos, 2616 do_proc_douintvec_minmax_conv, ¶m); 2617 } 2618 2619 static int do_proc_dopipe_max_size_conv(unsigned long *lvalp, 2620 unsigned int *valp, 2621 int write, void *data) 2622 { 2623 if (write) { 2624 unsigned int val; 2625 2626 val = round_pipe_size(*lvalp); 2627 if (val == 0) 2628 return -EINVAL; 2629 2630 *valp = val; 2631 } else { 2632 unsigned int val = *valp; 2633 *lvalp = (unsigned long) val; 2634 } 2635 2636 return 0; 2637 } 2638 2639 static int proc_dopipe_max_size(struct ctl_table *table, int write, 2640 void __user *buffer, size_t *lenp, loff_t *ppos) 2641 { 2642 return do_proc_douintvec(table, write, buffer, lenp, ppos, 2643 do_proc_dopipe_max_size_conv, NULL); 2644 } 2645 2646 static void validate_coredump_safety(void) 2647 { 2648 #ifdef CONFIG_COREDUMP 2649 if (suid_dumpable == SUID_DUMP_ROOT && 2650 core_pattern[0] != '/' && core_pattern[0] != '|') { 2651 printk(KERN_WARNING 2652 "Unsafe core_pattern used with fs.suid_dumpable=2.\n" 2653 "Pipe handler or fully qualified core dump path required.\n" 2654 "Set kernel.core_pattern before fs.suid_dumpable.\n" 2655 ); 2656 } 2657 #endif 2658 } 2659 2660 static int proc_dointvec_minmax_coredump(struct ctl_table *table, int write, 2661 void __user *buffer, size_t *lenp, loff_t *ppos) 2662 { 2663 int error = proc_dointvec_minmax(table, write, buffer, lenp, ppos); 2664 if (!error) 2665 validate_coredump_safety(); 2666 return error; 2667 } 2668 2669 #ifdef CONFIG_COREDUMP 2670 static int proc_dostring_coredump(struct ctl_table *table, int write, 2671 void __user *buffer, size_t *lenp, loff_t *ppos) 2672 { 2673 int error = proc_dostring(table, write, buffer, lenp, ppos); 2674 if (!error) 2675 validate_coredump_safety(); 2676 return error; 2677 } 2678 #endif 2679 2680 static int __do_proc_doulongvec_minmax(void *data, struct ctl_table *table, int write, 2681 void __user *buffer, 2682 size_t *lenp, loff_t *ppos, 2683 unsigned long convmul, 2684 unsigned long convdiv) 2685 { 2686 unsigned long *i, *min, *max; 2687 int vleft, first = 1, err = 0; 2688 size_t left; 2689 char *kbuf = NULL, *p; 2690 2691 if (!data || !table->maxlen || !*lenp || (*ppos && !write)) { 2692 *lenp = 0; 2693 return 0; 2694 } 2695 2696 i = (unsigned long *) data; 2697 min = (unsigned long *) table->extra1; 2698 max = (unsigned long *) table->extra2; 2699 vleft = table->maxlen / sizeof(unsigned long); 2700 left = *lenp; 2701 2702 if (write) { 2703 if (proc_first_pos_non_zero_ignore(ppos, table)) 2704 goto out; 2705 2706 if (left > PAGE_SIZE - 1) 2707 left = PAGE_SIZE - 1; 2708 p = kbuf = memdup_user_nul(buffer, left); 2709 if (IS_ERR(kbuf)) 2710 return PTR_ERR(kbuf); 2711 } 2712 2713 for (; left && vleft--; i++, first = 0) { 2714 unsigned long val; 2715 2716 if (write) { 2717 bool neg; 2718 2719 left -= proc_skip_spaces(&p); 2720 2721 err = proc_get_long(&p, &left, &val, &neg, 2722 proc_wspace_sep, 2723 sizeof(proc_wspace_sep), NULL); 2724 if (err) 2725 break; 2726 if (neg) 2727 continue; 2728 val = convmul * val / convdiv; 2729 if ((min && val < *min) || (max && val > *max)) 2730 continue; 2731 *i = val; 2732 } else { 2733 val = convdiv * (*i) / convmul; 2734 if (!first) { 2735 err = proc_put_char(&buffer, &left, '\t'); 2736 if (err) 2737 break; 2738 } 2739 err = proc_put_long(&buffer, &left, val, false); 2740 if (err) 2741 break; 2742 } 2743 } 2744 2745 if (!write && !first && left && !err) 2746 err = proc_put_char(&buffer, &left, '\n'); 2747 if (write && !err) 2748 left -= proc_skip_spaces(&p); 2749 if (write) { 2750 kfree(kbuf); 2751 if (first) 2752 return err ? : -EINVAL; 2753 } 2754 *lenp -= left; 2755 out: 2756 *ppos += *lenp; 2757 return err; 2758 } 2759 2760 static int do_proc_doulongvec_minmax(struct ctl_table *table, int write, 2761 void __user *buffer, 2762 size_t *lenp, loff_t *ppos, 2763 unsigned long convmul, 2764 unsigned long convdiv) 2765 { 2766 return __do_proc_doulongvec_minmax(table->data, table, write, 2767 buffer, lenp, ppos, convmul, convdiv); 2768 } 2769 2770 /** 2771 * proc_doulongvec_minmax - read a vector of long integers with min/max values 2772 * @table: the sysctl table 2773 * @write: %TRUE if this is a write to the sysctl file 2774 * @buffer: the user buffer 2775 * @lenp: the size of the user buffer 2776 * @ppos: file position 2777 * 2778 * Reads/writes up to table->maxlen/sizeof(unsigned long) unsigned long 2779 * values from/to the user buffer, treated as an ASCII string. 2780 * 2781 * This routine will ensure the values are within the range specified by 2782 * table->extra1 (min) and table->extra2 (max). 2783 * 2784 * Returns 0 on success. 2785 */ 2786 int proc_doulongvec_minmax(struct ctl_table *table, int write, 2787 void __user *buffer, size_t *lenp, loff_t *ppos) 2788 { 2789 return do_proc_doulongvec_minmax(table, write, buffer, lenp, ppos, 1l, 1l); 2790 } 2791 2792 /** 2793 * proc_doulongvec_ms_jiffies_minmax - read a vector of millisecond values with min/max values 2794 * @table: the sysctl table 2795 * @write: %TRUE if this is a write to the sysctl file 2796 * @buffer: the user buffer 2797 * @lenp: the size of the user buffer 2798 * @ppos: file position 2799 * 2800 * Reads/writes up to table->maxlen/sizeof(unsigned long) unsigned long 2801 * values from/to the user buffer, treated as an ASCII string. The values 2802 * are treated as milliseconds, and converted to jiffies when they are stored. 2803 * 2804 * This routine will ensure the values are within the range specified by 2805 * table->extra1 (min) and table->extra2 (max). 2806 * 2807 * Returns 0 on success. 2808 */ 2809 int proc_doulongvec_ms_jiffies_minmax(struct ctl_table *table, int write, 2810 void __user *buffer, 2811 size_t *lenp, loff_t *ppos) 2812 { 2813 return do_proc_doulongvec_minmax(table, write, buffer, 2814 lenp, ppos, HZ, 1000l); 2815 } 2816 2817 2818 static int do_proc_dointvec_jiffies_conv(bool *negp, unsigned long *lvalp, 2819 int *valp, 2820 int write, void *data) 2821 { 2822 if (write) { 2823 if (*lvalp > INT_MAX / HZ) 2824 return 1; 2825 *valp = *negp ? -(*lvalp*HZ) : (*lvalp*HZ); 2826 } else { 2827 int val = *valp; 2828 unsigned long lval; 2829 if (val < 0) { 2830 *negp = true; 2831 lval = -(unsigned long)val; 2832 } else { 2833 *negp = false; 2834 lval = (unsigned long)val; 2835 } 2836 *lvalp = lval / HZ; 2837 } 2838 return 0; 2839 } 2840 2841 static int do_proc_dointvec_userhz_jiffies_conv(bool *negp, unsigned long *lvalp, 2842 int *valp, 2843 int write, void *data) 2844 { 2845 if (write) { 2846 if (USER_HZ < HZ && *lvalp > (LONG_MAX / HZ) * USER_HZ) 2847 return 1; 2848 *valp = clock_t_to_jiffies(*negp ? -*lvalp : *lvalp); 2849 } else { 2850 int val = *valp; 2851 unsigned long lval; 2852 if (val < 0) { 2853 *negp = true; 2854 lval = -(unsigned long)val; 2855 } else { 2856 *negp = false; 2857 lval = (unsigned long)val; 2858 } 2859 *lvalp = jiffies_to_clock_t(lval); 2860 } 2861 return 0; 2862 } 2863 2864 static int do_proc_dointvec_ms_jiffies_conv(bool *negp, unsigned long *lvalp, 2865 int *valp, 2866 int write, void *data) 2867 { 2868 if (write) { 2869 unsigned long jif = msecs_to_jiffies(*negp ? -*lvalp : *lvalp); 2870 2871 if (jif > INT_MAX) 2872 return 1; 2873 *valp = (int)jif; 2874 } else { 2875 int val = *valp; 2876 unsigned long lval; 2877 if (val < 0) { 2878 *negp = true; 2879 lval = -(unsigned long)val; 2880 } else { 2881 *negp = false; 2882 lval = (unsigned long)val; 2883 } 2884 *lvalp = jiffies_to_msecs(lval); 2885 } 2886 return 0; 2887 } 2888 2889 /** 2890 * proc_dointvec_jiffies - read a vector of integers as seconds 2891 * @table: the sysctl table 2892 * @write: %TRUE if this is a write to the sysctl file 2893 * @buffer: the user buffer 2894 * @lenp: the size of the user buffer 2895 * @ppos: file position 2896 * 2897 * Reads/writes up to table->maxlen/sizeof(unsigned int) integer 2898 * values from/to the user buffer, treated as an ASCII string. 2899 * The values read are assumed to be in seconds, and are converted into 2900 * jiffies. 2901 * 2902 * Returns 0 on success. 2903 */ 2904 int proc_dointvec_jiffies(struct ctl_table *table, int write, 2905 void __user *buffer, size_t *lenp, loff_t *ppos) 2906 { 2907 return do_proc_dointvec(table,write,buffer,lenp,ppos, 2908 do_proc_dointvec_jiffies_conv,NULL); 2909 } 2910 2911 /** 2912 * proc_dointvec_userhz_jiffies - read a vector of integers as 1/USER_HZ seconds 2913 * @table: the sysctl table 2914 * @write: %TRUE if this is a write to the sysctl file 2915 * @buffer: the user buffer 2916 * @lenp: the size of the user buffer 2917 * @ppos: pointer to the file position 2918 * 2919 * Reads/writes up to table->maxlen/sizeof(unsigned int) integer 2920 * values from/to the user buffer, treated as an ASCII string. 2921 * The values read are assumed to be in 1/USER_HZ seconds, and 2922 * are converted into jiffies. 2923 * 2924 * Returns 0 on success. 2925 */ 2926 int proc_dointvec_userhz_jiffies(struct ctl_table *table, int write, 2927 void __user *buffer, size_t *lenp, loff_t *ppos) 2928 { 2929 return do_proc_dointvec(table,write,buffer,lenp,ppos, 2930 do_proc_dointvec_userhz_jiffies_conv,NULL); 2931 } 2932 2933 /** 2934 * proc_dointvec_ms_jiffies - read a vector of integers as 1 milliseconds 2935 * @table: the sysctl table 2936 * @write: %TRUE if this is a write to the sysctl file 2937 * @buffer: the user buffer 2938 * @lenp: the size of the user buffer 2939 * @ppos: file position 2940 * @ppos: the current position in the file 2941 * 2942 * Reads/writes up to table->maxlen/sizeof(unsigned int) integer 2943 * values from/to the user buffer, treated as an ASCII string. 2944 * The values read are assumed to be in 1/1000 seconds, and 2945 * are converted into jiffies. 2946 * 2947 * Returns 0 on success. 2948 */ 2949 int proc_dointvec_ms_jiffies(struct ctl_table *table, int write, 2950 void __user *buffer, size_t *lenp, loff_t *ppos) 2951 { 2952 return do_proc_dointvec(table, write, buffer, lenp, ppos, 2953 do_proc_dointvec_ms_jiffies_conv, NULL); 2954 } 2955 2956 static int proc_do_cad_pid(struct ctl_table *table, int write, 2957 void __user *buffer, size_t *lenp, loff_t *ppos) 2958 { 2959 struct pid *new_pid; 2960 pid_t tmp; 2961 int r; 2962 2963 tmp = pid_vnr(cad_pid); 2964 2965 r = __do_proc_dointvec(&tmp, table, write, buffer, 2966 lenp, ppos, NULL, NULL); 2967 if (r || !write) 2968 return r; 2969 2970 new_pid = find_get_pid(tmp); 2971 if (!new_pid) 2972 return -ESRCH; 2973 2974 put_pid(xchg(&cad_pid, new_pid)); 2975 return 0; 2976 } 2977 2978 /** 2979 * proc_do_large_bitmap - read/write from/to a large bitmap 2980 * @table: the sysctl table 2981 * @write: %TRUE if this is a write to the sysctl file 2982 * @buffer: the user buffer 2983 * @lenp: the size of the user buffer 2984 * @ppos: file position 2985 * 2986 * The bitmap is stored at table->data and the bitmap length (in bits) 2987 * in table->maxlen. 2988 * 2989 * We use a range comma separated format (e.g. 1,3-4,10-10) so that 2990 * large bitmaps may be represented in a compact manner. Writing into 2991 * the file will clear the bitmap then update it with the given input. 2992 * 2993 * Returns 0 on success. 2994 */ 2995 int proc_do_large_bitmap(struct ctl_table *table, int write, 2996 void __user *buffer, size_t *lenp, loff_t *ppos) 2997 { 2998 int err = 0; 2999 bool first = 1; 3000 size_t left = *lenp; 3001 unsigned long bitmap_len = table->maxlen; 3002 unsigned long *bitmap = *(unsigned long **) table->data; 3003 unsigned long *tmp_bitmap = NULL; 3004 char tr_a[] = { '-', ',', '\n' }, tr_b[] = { ',', '\n', 0 }, c; 3005 3006 if (!bitmap || !bitmap_len || !left || (*ppos && !write)) { 3007 *lenp = 0; 3008 return 0; 3009 } 3010 3011 if (write) { 3012 char *kbuf, *p; 3013 3014 if (left > PAGE_SIZE - 1) 3015 left = PAGE_SIZE - 1; 3016 3017 p = kbuf = memdup_user_nul(buffer, left); 3018 if (IS_ERR(kbuf)) 3019 return PTR_ERR(kbuf); 3020 3021 tmp_bitmap = kzalloc(BITS_TO_LONGS(bitmap_len) * sizeof(unsigned long), 3022 GFP_KERNEL); 3023 if (!tmp_bitmap) { 3024 kfree(kbuf); 3025 return -ENOMEM; 3026 } 3027 proc_skip_char(&p, &left, '\n'); 3028 while (!err && left) { 3029 unsigned long val_a, val_b; 3030 bool neg; 3031 3032 err = proc_get_long(&p, &left, &val_a, &neg, tr_a, 3033 sizeof(tr_a), &c); 3034 if (err) 3035 break; 3036 if (val_a >= bitmap_len || neg) { 3037 err = -EINVAL; 3038 break; 3039 } 3040 3041 val_b = val_a; 3042 if (left) { 3043 p++; 3044 left--; 3045 } 3046 3047 if (c == '-') { 3048 err = proc_get_long(&p, &left, &val_b, 3049 &neg, tr_b, sizeof(tr_b), 3050 &c); 3051 if (err) 3052 break; 3053 if (val_b >= bitmap_len || neg || 3054 val_a > val_b) { 3055 err = -EINVAL; 3056 break; 3057 } 3058 if (left) { 3059 p++; 3060 left--; 3061 } 3062 } 3063 3064 bitmap_set(tmp_bitmap, val_a, val_b - val_a + 1); 3065 first = 0; 3066 proc_skip_char(&p, &left, '\n'); 3067 } 3068 kfree(kbuf); 3069 } else { 3070 unsigned long bit_a, bit_b = 0; 3071 3072 while (left) { 3073 bit_a = find_next_bit(bitmap, bitmap_len, bit_b); 3074 if (bit_a >= bitmap_len) 3075 break; 3076 bit_b = find_next_zero_bit(bitmap, bitmap_len, 3077 bit_a + 1) - 1; 3078 3079 if (!first) { 3080 err = proc_put_char(&buffer, &left, ','); 3081 if (err) 3082 break; 3083 } 3084 err = proc_put_long(&buffer, &left, bit_a, false); 3085 if (err) 3086 break; 3087 if (bit_a != bit_b) { 3088 err = proc_put_char(&buffer, &left, '-'); 3089 if (err) 3090 break; 3091 err = proc_put_long(&buffer, &left, bit_b, false); 3092 if (err) 3093 break; 3094 } 3095 3096 first = 0; bit_b++; 3097 } 3098 if (!err) 3099 err = proc_put_char(&buffer, &left, '\n'); 3100 } 3101 3102 if (!err) { 3103 if (write) { 3104 if (*ppos) 3105 bitmap_or(bitmap, bitmap, tmp_bitmap, bitmap_len); 3106 else 3107 bitmap_copy(bitmap, tmp_bitmap, bitmap_len); 3108 } 3109 *lenp -= left; 3110 *ppos += *lenp; 3111 } 3112 3113 kfree(tmp_bitmap); 3114 return err; 3115 } 3116 3117 #else /* CONFIG_PROC_SYSCTL */ 3118 3119 int proc_dostring(struct ctl_table *table, int write, 3120 void __user *buffer, size_t *lenp, loff_t *ppos) 3121 { 3122 return -ENOSYS; 3123 } 3124 3125 int proc_dointvec(struct ctl_table *table, int write, 3126 void __user *buffer, size_t *lenp, loff_t *ppos) 3127 { 3128 return -ENOSYS; 3129 } 3130 3131 int proc_douintvec(struct ctl_table *table, int write, 3132 void __user *buffer, size_t *lenp, loff_t *ppos) 3133 { 3134 return -ENOSYS; 3135 } 3136 3137 int proc_dointvec_minmax(struct ctl_table *table, int write, 3138 void __user *buffer, size_t *lenp, loff_t *ppos) 3139 { 3140 return -ENOSYS; 3141 } 3142 3143 int proc_douintvec_minmax(struct ctl_table *table, int write, 3144 void __user *buffer, size_t *lenp, loff_t *ppos) 3145 { 3146 return -ENOSYS; 3147 } 3148 3149 int proc_dointvec_jiffies(struct ctl_table *table, int write, 3150 void __user *buffer, size_t *lenp, loff_t *ppos) 3151 { 3152 return -ENOSYS; 3153 } 3154 3155 int proc_dointvec_userhz_jiffies(struct ctl_table *table, int write, 3156 void __user *buffer, size_t *lenp, loff_t *ppos) 3157 { 3158 return -ENOSYS; 3159 } 3160 3161 int proc_dointvec_ms_jiffies(struct ctl_table *table, int write, 3162 void __user *buffer, size_t *lenp, loff_t *ppos) 3163 { 3164 return -ENOSYS; 3165 } 3166 3167 int proc_doulongvec_minmax(struct ctl_table *table, int write, 3168 void __user *buffer, size_t *lenp, loff_t *ppos) 3169 { 3170 return -ENOSYS; 3171 } 3172 3173 int proc_doulongvec_ms_jiffies_minmax(struct ctl_table *table, int write, 3174 void __user *buffer, 3175 size_t *lenp, loff_t *ppos) 3176 { 3177 return -ENOSYS; 3178 } 3179 3180 3181 #endif /* CONFIG_PROC_SYSCTL */ 3182 3183 /* 3184 * No sense putting this after each symbol definition, twice, 3185 * exception granted :-) 3186 */ 3187 EXPORT_SYMBOL(proc_dointvec); 3188 EXPORT_SYMBOL(proc_douintvec); 3189 EXPORT_SYMBOL(proc_dointvec_jiffies); 3190 EXPORT_SYMBOL(proc_dointvec_minmax); 3191 EXPORT_SYMBOL_GPL(proc_douintvec_minmax); 3192 EXPORT_SYMBOL(proc_dointvec_userhz_jiffies); 3193 EXPORT_SYMBOL(proc_dointvec_ms_jiffies); 3194 EXPORT_SYMBOL(proc_dostring); 3195 EXPORT_SYMBOL(proc_doulongvec_minmax); 3196 EXPORT_SYMBOL(proc_doulongvec_ms_jiffies_minmax); 3197